Complete WPF Overview Tutorial with Example - iFour Technolab
                      
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❑What is WPF?
❏ WPF, which stands for Windows Presentation Foundation, is Microsoft's latest approach to a GUI 
framework, used with the .NET framework.
❏ WPF , previously known as "Avalon", was initially released as part of .NET Framework 3.0 in 2006 , and 
then so many other features were added in the subsequent .NET framework versions. 
❏ It is a powerful framework for building Windows applications.
❏ WPF offers Separation of Appearance and Behaviour.
❏ WPF contains features that will help you develop rich windows applications. 
❏ WPF employs XAML, an XML-based language, to define and link various interface elements.
❏ WPF has a built-in set of data services to enable application developers to bind and manipulate data within 
applications
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❑Architecture of WPF
 The major components of WPF architecture are as shown in the figure. The 
most important code part of WPF are −
 Presentation Framework
 Presentation Core
 Milcore
 The architecture of WPF can be classified into three layers,
 Managed Layer
 Unmanaged Layer
 Core API Layer
Managed Layer
 The Presentation Framework : This DLL consists of all classes that are 
required to create the WPF UI. This wraps up the controls, data bindings, 
styling, shapes, media, documents, annotations, animation and more.
 Presentation core : This is a low-level API exposed by WPF providing features 
for 2D, 3D, geometry and so on. 
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Unmanaged layer
 Milcore is a part of unmanaged code which allows tight integration with 
DirectX (responsible for display and rendering).
 WindowsCodecs : WindowsCodecs provides Imaging support in WPF. 
Image display, processing, scaling and transform are all handled by 
WindowsCodecs
 CLR makes the development process more productive by offering many 
features such as memory management, error handling, etc.
Core API Layer 
 This layer has OS core components like Kernel, User32, GDI, Device Drivers, Graphic cards etc. These components 
are used by the application to access low-level APIs. User32 manages memory and process separation.
 DirectX : DirectX is the low-level API through which WPF renders all graphics. DirectX talks with drivers and 
renders the content.
 GDI : GDI stands for Graphic Device Interface. GDI provides an expanded set of graphics primitives and a number 
of improvements in rendering quality.
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❑WPF Advantages
 In the earlier GUI frameworks, there was no real separation between how an application looks like and how 
it behaved.
 In WPF, UI elements are designed in XAML while behaviors can be implemented in procedural languages 
such C# and VB.Net. So it very easy to separate behavior from the designer code.
 With XAML, the programmers can work in parallel with the designers.
 The separation between a GUI and its behavior can allow us to easily change the look of a control by using 
styles and templates.
 Easier animation and special effects.
 Support rich data visualization.
 UIs are completely re-sizable without loss of quality.
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❑WPF Features
Feature Description
Control inside a Control Allows to define a control inside another control as a content.
Data binding Mechanism to display and interact with data between UI elements 
and data object on user interface.
Media services Provides an integrated system for building user interfaces with 
common media elements like images, audio, and video.
Templates In WPF you can define the look of an element directly with a 
Template
Animations Building interactivity and movement on user Interface
Alternative input Supports multi-touch input on Windows 7 and above.
Direct3D Allows to display more complex graphics and custom themes
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Index
❏ What is XAML?
❏ Advantages of XAML
❏ Basic Syntax of XAML
❏ Namespaces
❏ Why XAML in WPF
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❑What is XAML?
❏ XAML stands for Extensible Application Markup Language
❏ Its a simple language based on XML to create and initialize .NET objects with hierarchical 
relations. 
❏ Today XAML is used to create user interfaces in WPF, Silverlight, declare workflows in WF 
(Workflow Foundation) and for electronic paper in the XPS standard.
❏ All classes in WPF have parameterless constructors and make excessive usage of properties. That 
is done to make it perfectly fit for XML languages like XAML.
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❑Advantage of XAML
❏ It very easy to create, initialize, and set properties of objects with hierarchical relations.
❏ XAML code is short and clear to read
❏ Separation of designer code and logic
❏ Graphical design tools like Expression Blend require XAML as source.
❏ The goal of XAML is to enable visual designers to create user interface elements directly.
❏ All you can do in XAML can also be done in code. XAML is just another way to create and initialize 
objects. You can use WPF without using XAML. It's up to you if you want to declare it in XAML or 
write it in code. 
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❑Basic Synatx of XAML
❏ When you create your new WPF project, you will encounter some of the XAML code by default in 
MainWindow.xaml as shown below.
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Information Description
 End of object element of the root
 It is starting and closing tags of an empty grid object.
 Closing the object element
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❑Syntax
❏ The syntax of an Object element starts with a left angle bracket ().
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❑Syntax
❏ Example of simple object with no child element
 
❏ Example of object element with some attributes
 
 
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❑Syntax
❏ Example of an alternate syntax do define properties (Property element syntax)
 
   Click Me 
   30 
   60 
 
❏ Example of Object with Child Element: StackPanel contains Textblock as child element
 
 
 
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❑Namespaces
❏ At the beginning of every XAML file you need to include two namespaces. 
❏ The first is http://schemas.microsoft.com/winfx/2006/xaml/presentation. It is mapped to all wpf controls 
in System.Windows.Controls. 
❏ The second is http://schemas.microsoft.com/winfx/2006/xaml it is mapped to System.Windows.Markup 
that defines the XAML keywords.
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❑Why XAML in WPF?
❏ Both XAML & WPF are independent pieces of technology.
❏ For better Understanding, let us create a window with a button in it using XAML as below :
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❏ Output :
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❏ In case you choose not to use XAML in WPF, then you can achieve the same GUI result with procedural 
language as well. Let’s have a look at the same example, but this time, we will create a button in C#
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❏ From the above example, it is clear that what you can do in XAML to create, initialize, and set 
properties of objects, the same tasks can also be done using code.
❏ So below are the two less known facts about XAML :
❏ WPF doesn't need XAML
❏ XAML doesn't need WPF
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❑Element Tree
❏ Windows Presentation Foundation (WPF) has a comprehensive tree structure in the form of objects. In 
WPF, there are two ways that a complete object tree is conceptualized −
❏ Logical Tree Structure
❏ Visual Tree Structure
❏ There are many technologies where the elements and components are ordered in a tree structure so that 
the programmers can easily handle the object and change the behavior of an application.
❏ Mostly, WPF developers and designers either use procedural language to create an application or design 
the UI part of the application in XAML keeping in mind the object tree structure.
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❑Logical Tree Structure
❏ In WPF applications, the structure of the UI elements in XAML represents the logical tree structure. In 
XAML, the basic elements of UI are declared by the developer. The logical tree in WPF defines the 
following −
❏ Dependency properties
❏ Static and dynamic resources
❏ Binding the elements on its name etc.
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❏ Let’s have a look at the following example in which a button and a list box are created.
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❑Visual Tree Structure
❏ In WPF, the concept of the visual tree describes the structure of visual objects, as represented by the 
Visual Base Class. It signifies all the UI elements which are rendered to the output screen.
❏ When a programmer wants to create a template for a particular control, he is actually rendering the 
visual tree of that control. The visual tree is also very useful for those who want to draw lower level 
controls for performance and optimization reasons.
❏ In WPF applications, visual tree is used for −
❏ Rendering the visual objects.
❏ Rendering the layouts.
❏ The routed events mostly travel along the visual tree, not the logical tree.
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❑Visual Tree Structure
❏ In WPF, the concept of the visual tree describes the structure of visual objects, as represented by the 
Visual Base Class. It signifies all the UI elements which are rendered to the output screen.
❏ When a programmer wants to create a template for a particular control, he is actually rendering the 
visual tree of that control. The visual tree is also very useful for those who want to draw lower level 
controls for performance and optimization reasons.
❏ In WPF applications, visual tree is used for −
❏ Rendering the visual objects.
❏ Rendering the layouts.
❏ The routed events mostly travel along the visual tree, not the logical tree.
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❏ The logical tree leaves out a lot of detail enabling you to focus on the core structure of the user interface 
and to ignore the details of exactly how it has been presented.
❏ The logical tree is what you use to create the basic structure of the user interface.
❏ The visual tree will be of interest if you're focusing on the presentation. For example, if you wish to 
customize the appearance of any UI element, you will need to use the visual tree.
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❑Layout
❏ The layout of controls is very important and critical for application usability. It is used to arrange a group 
of GUI elements in your application. There are certain important things to consider while selecting layout 
panels −
❏ Positions of the child elements
❏ Sizes of the child elements
❏ Layering of overlapping child elements on top of each other
❏ Fixed pixel arrangement of controls doesn’t work when the application is to be sed on different screen 
resolutions. XAML provides a rich set of built-in layout panels to arrange GUI elements in an appropriate 
way. Some of the most commonly used and popular layout panels are as follows −
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Sr. No. Panels & Description
1 Stack panel is a simple and useful layout panel in XAML. In stack panel, child 
elements can be arranged in a single line, either horizontally or vertically, based on 
the orientation property.
2 In WrapPanel, child elements are positioned in sequential order, from left to right or 
from top to bottom based on the orientation property.
3 DockPanel defines an area to arrange child elements relative to each other, either 
horizontally or vertically. With DockPanel you can easily dock child elements to top, 
bottom, right, left and center using the Dock property.
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Sr. No. Panels & Description
4 Canvas panel is the basic layout panel in which the child elements can be positioned 
explicitly using coordinates that are relative to the Canvas any side such as left, 
right, top and bottom.
5 A Grid Panel provides a flexible area which consists of rows and columns. In a Grid, 
child elements can be arranged in tabular form.
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Nesting layout
 Nesting of layout means the use layout panel inside another layout, e.g. define stack 
panels inside a grid. This concept is widely used to take the advantages of multiple 
layouts in an application. 
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 Considering example of real world wherein 
we used grid layout for outlining and used 
stackpanel to display controls inside it.
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 Output –
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Controls
 Windows Presentation Foundation (WPF) allows developers to easily build and create 
visually enriched UI based applications.
 The classical UI elements or controls in other UI frameworks are also enhanced in 
WPF applications.
 All of the standard WPF controls can be found in the Toolbox which is a part of the 
System.Windows.Controls.
 These controls can also be created in XAML markup language.
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Control Library
 Grid Layout Building Blocks
 Label  ToolTip
 Buttons  Thumb
 Editors  Border
 Lists  Popup
 Menus and toolbars  Document Viewers
 Scroll Viewer  Frame
 Ranges
 Containers
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Grid Layout
 Grid
 Column Definition
 Row Definition
 Grid Lines
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Labels
 The Label control, in its most simple form, will look very much like the TextBlock which 
we used in another article. You will quickly notice though that instead of a Text property, 
the Label has a Content property. The reason for that is that the Label can host any kind 
of control directly inside of it, instead of just text.
 
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Buttons
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Editors
 PasswordBox
 TextBox
 RichTextBox
 InkCanvas
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List
 Four standard list controls- ListBox, ComboBox, ListView, TreeView.
 List controls can be filled from one of the two sources.
   1. Items Property
   2. ItemsSource Property.
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List View
 List view derives from listBox
 It has ability to separate view properties from control properties.
 View property must be changed to grid view ad set properties on that object.
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Tree view









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New Lists using Templates
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Menus & ToolBars
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Expander
 Expander is a layout in which we can add 
    
 We can assign the expand direction either          
 
 
 
        

  
 
   
  
 
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Dialog
 Standalone applications typically have a main window that both displays the main data over which the application operates and 
exposes the functionality to process that data through user interface (UI) mechanisms like menu bars, tool bars, and status bars. A 
non-trivial application may also display additional windows to do the following:
 Display specific information to users.
 Gather information from users.
 Both display and gather information.
 These types of windows are known as dialog boxes, and there are two types: modal and modeless.
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 A modal dialog box is displayed by a function when the  A modeless dialog box, on the other hand, does not prevent 
function needs additional data from a user to continue. a user from activating other windows while it is open. 
Because the function depends on the modal dialog box to  For example, if a user wants to find occurrences of a 
gather data particular word in a document, a main window will often 
 the modal dialog box also prevents a user from activating open a dialog box to ask a user what word they are looking 
other windows in the application while it remains open. for.
 In most cases, a modal dialog box allows a user to signal   Since finding a word doesn't prevent a user from editing the 
when they have finished with the modal dialog box by document, however, the dialog box doesn't need to be 
pressing either an OK or Cancel button. modal. 
 Pressing the OK button indicates that a user has entered  A modeless dialog box at least provides a Close button to 
data and wants the function to continue processing with that close the dialog box.
data.
 Pressing the Cancel button indicates that a user wants to 
stop the function from executing altogether
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Dialog-Message box
 A message box is a dialog box that can be used to display textual information and to allow users to make 
decisions with buttons. 
 To create a message box, you use the MessageBox class. MessageBox lets you configure the message box 
text, title, icon, and buttons, using code like the following.
 The following figure shows a message box that displays textual information, asks a question, and provides 
the user with three buttons to answer the question.
string messageBoxText = "Do you want to save 
changes?";
string caption = "Word Processor";
MessageBoxButton button = 
MessageBoxButton.YesNoCancel;
MessageBoxImage icon = MessageBoxImage.Warning;
// Display message box 
MessageBox.Show(messageBoxText, caption, button, icon);
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Message box(cont..)
// Display message box
MessageBoxResult result = MessageBox.Show(messageBoxText, caption, button, icon);
// Process message box results
switch (result)
{
    case MessageBoxResult.Yes:
        // User pressed Yes button
        break;
    case MessageBoxResult.No:
        // User pressed No button
        // ...
        break;
    case MessageBoxResult.Cancel:
        // User pressed Cancel button
        // ...
        break;
}
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 Other Common Dialog Boxes are
 Open File Dialog
 Save File Dialog Box
 Print Dialog Box
 A modeless dialog box, such as the Find Dialog  A modeless dialog box is opened by calling the Show
Box shown in the following figure, has the same 
 method.
fundamental appearance as the modal dialog 
box.  Unlike ShowDialog, Show returns immediately. 
Consequently, the calling window cannot tell when the 
modeless dialog box is closed and, therefore, does not 
 Screenshot that shows a Find dialog box. know when to check for a dialog box result or get data 
from the dialog box for further processing. 
 However, the behavior is slightly different, as  Instead, the dialog box needs to create an alternative 
described in the following sections. way to return data to the calling window for 
processing.
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Window
   
and manage the lifetime of windows and dialog     
        
boxes.             
            
 When you create a new WPF project, then by default,         
the Window control is present.  
        
            
                
                
            
        
 
        
            
        
    

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Context Menu
 A context menu, often referred to as a popup or pop-up menu, is a menu which is shown upon certain user actions, 
usually a right-click with the mouse on a specific control or window. 
 Contextual menus are often used to offer functionality that's relevant within a single control.
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Third-party controls 
 Third-party controls are those which are not created 
by Microsoft but are created by some individual or 
company by using WPF User Control or Custom 
Control. Telerik and DevExpress are the most popular 
companies for creating third-party controls.
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Calendar
⚫ Calendar is a control that enables a user to select a date by using a visual calendar 
display.
⚫  It provides some basic navigation using either the mouse or keyboard
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Cont.….
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Date picker
⚫ A Date Picker is a control that allows a user to pick a date value. 
⚫ The user picks the date by using Combo Box selection for month, day, and year 
values
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Cont.….
                                                                    Properties
Date Gets or sets the date currently set in the date 
picker.
DayFormat Gets or sets the display format for the day value.
DayFormatProperty Gets the identifier for the DayFormat 
dependency property.
Orientation Gets or sets a value that indicates whether the 
day, month, and year selectors are stacked 
horizontally or vertically.
YearFormat Gets or sets the display format for the year 
value.
MonthFormat Gets or sets the display format for the month 
value.
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Image
⚫ A control that displays an image, you can use either the Image object or the Image 
Brush object.
⚫  An Image object display an image, while an Image Brush object paints another 
object with an image.
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Cont.….
                                                                    Properties
wSource Gets or sets the source for the image.
Width Gets or sets the width of a FrameworkElement. 
(Inherited from FrameworkElement)
StretchProperty Identifies the Stretch dependency property.
Opacity Gets or sets the degree of the object's opacity. 
(Inherited from UIElement)
Name Gets or sets the identifying name of the object.
CanDrag Gets or sets a value that indicates whether the 
element can be dragged as data in a drag-and-
drop operation. (Inherited from UIElement)
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Popup
⚫ Popup is a control that displays content on top of existing content, within the 
bounds of the application window. 
⚫ It is a temporary display on other content. 
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Cont.….
                                                                    Properties
Child Gets or sets the content to be hosted in the 
popup.
ChildProperty Gets the identifier for the Child dependency 
property.
IsOpen Gets or sets whether the popup is currently 
displayed on the screen.
Opacity Gets or sets the degree of the object's opacity. 
(Inherited from UIElement)
Name Gets or sets the identifying name of the object.
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Progress Bar
⚫ Progress Bar is a control that indicates the progress of an operation, where the 
typical visual appearance is a bar that animates a filled area as the progress 
continues. 
It can show the progress in one of the two following styles −
⚫ A bar that displays a repeating pattern, or
⚫ A bar that fills based on a value.
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Cont.….
                                                                    Properties
IsIndeterminate Gets or sets a value that indicates whether the 
progress bar reports generic progress with a 
repeating pattern or reports progress based on 
the Value property.
ShowError Gets or sets a value that indicates whether the 
progress bar should use visual states that 
communicate an Error state to the user.
ShowPaused Gets or sets a value that indicates whether the 
progress bar should use visual states that 
communicate a Paused state to the user.
Name Gets or sets the identifying name of the object.
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Scroll Viewer 
⚫ A ScrollViewer is a control that provides a scrollable area that can contain other 
visible elements.
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Cont.….
                                                                    Properties
ComputedHorizontalScrollBarVisibility Gets a value that indicates whether the 
horizontal ScrollBar is visible.
ComputedHorizontalScrollBarVisibilityProper Identifies the 
ty ComputedHorizontalScrollBarVisibility 
dependency property.
ScrollableHeight Gets a value that represents the vertical size of 
the area that can be scrolled; the difference 
between the width of the extent and the width of 
the viewport.
Name Gets or sets the identifying name of the object.
ScrollableWidth Gets a value that represents the horizontal size 
of the area that can be scrolled; the difference 
between the width of the extent and the width of 
the viewport.
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Toggle Button
⚫ A Toggle Button is a control that can switch states, such as CheckBox and 
RadioButton. .
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Cont.….
                                                                    Properties
IsChecked Gets or sets whether the ToggleButton is 
checked.
IsCheckedProperty Identifies the IsChecked dependency property.
IsThreeState Gets or sets a value that indicates whether the 
control supports three states
Name Gets or sets the identifying name of the object.
IsThreeStateProperty Identifies the IsThreeState dependency property.
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tooltip 
⚫ A tooltip is a control that creates a pop-up window that displays information for 
an element in the GUI.
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Cont.….
                                                                    Properties
IsOpen Gets or sets a value that indicates whether the 
ToolTip is visible.
Placement Gets or sets how a ToolTip is positioned in 
relation to the placement target element.
PlacementTarget Gets or sets the visual element or control that 
the tool tip should be positioned in relation to 
when opened by the ToolTipService.
Name Gets or sets the identifying name of the object.
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❑Dependency Property
❏ In WPF applications, Dependency property is a specific type of property which extends the CLR 
property. It takes the advantage of specific functionalities available in the WPF property system.
❏ A class which defines a dependency property must be inherited from the DependencyObject 
class. 
❏ Many of the UI controls class which are used in XAML are derived from the DependencyObject 
class and they support dependency properties, e.g. Button class supports the IsMouseOver 
dependency property.
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❑Dependency Property (Cont...)
❏ The following XAML code creates a button with some properties.

                 
 
 
 
 
 
             


 
 
 
 
 
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❑Why We Need Dependency Properties
❏ Dependency property gives you all kinds of benefits when you use it in your application. 
Dependency Property can used over a CLR property in the following scenarios −
❏ If you want to set the style
❏ If you want data binding
❏ If you want to set with a resource (a static or a dynamic resource)
❏ If you want to support animation
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❑Why We Need Dependency Properties
❏ Basically, Dependency Properties offer a lot of functionalities that you won’t get by using a CLR 
property.
❏ The main difference between dependency properties and other CLR properties are listed below −
❏ CLR properties can directly read/write from the private member of a class by using getter and setter. 
In contrast, dependency properties are not stored in local object.
❏ Dependency properties are stored in a dictionary of key/value pairs which is provided by the 
DependencyObject class. It also saves a lot of memory because it stores the property when changed. 
It can be bound in XAML as well.
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❑Routed Event
❏ A Routed Event is a type of event that can invoke handlers on multiple listeners in an element 
tree rather than just the object that raised the event. It is basically a CLR event that is supported 
by an instance of the Routed Event class. It is registered with the WPF event system. 
RoutedEvents have three main routing strategies which are as follows −
❏ Direct Event
❏ Bubbling Event
❏ Tunnel Event
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❑Bubbling Event
❏ A Bubbling Event begins with the element where the event is originated. 
❏ Then it travels up the visual tree to the topmost element in the visual tree. 
❏ So, in WPF, the topmost element is most likely a window.
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❑Tunnel Event
❏ Event handlers on the element tree root are invoked and then the event travels down the visual 
tree to all the children nodes until it reaches the element in which the event originated.
❏ The difference between a bubbling and a tunneling event is that a tunneling event will always 
start with a preview.
❏ In a WPF application, events are often implemented as a tunneling/bubbling pair. So, you'll have 
a preview MouseDown and then a MouseDown event.
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❑Direct Event
❏ A Direct Event is similar to events in Windows forms which are raised by the element in which 
the event is originated.
❏ Unlike a standard CLR event, direct routed events support class handling and they can be used in 
Event Setters and Event Triggers within your style of your Custom Control.
❏ A good example of a direct event would be the MouseEnter Event.
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Input And Data Binding
 Windows Presentation Foundation (WPF) provides a powerful API with the help of which 
applications can get input from various devices such as mouse, keyboard, and touch 
panels.
 Data binding is the process that establishes a connection between the application UI and 
business logic. If the binding has the correct settings and the data provides the proper 
notifications, then, when the data changes its value, the elements that are bound to the 
data reflect changes automatically
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What We Will Cover
 Binding data to UI Elements
 Using Converters to convert data during Binding
 Using Data Templates to visualize data
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Data Binding Concepts
Binding Components
Target Object
Target Property
Binding Source
Path
Target Property Must be a dependency property
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Binding Modes
OneWay-Updates the target property only when the source property change.
TwoWay-Updates the target property or the property whenever either the target 
property or the source property changes.
OneWayToSource-updates the source property when the target property changes
OneTime- Updates the target property only when the application starts or when 
the DataContext undergoes a change.
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What Triggers Updates
Triggering supported by TwoWay or OneWayToSource mode of binding
Dependency property or INotifyPropertyChanged
UpdateSourceTrigger property
Explicit -Updates the binding source only when you call.
UpdateSource- method. 
LostFocus-Updates the binding source whenever the binding target element 
loses
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Data Binding Methods
Binding using XAML
Binding using Code
  
  
  MyData myDataObject = new MyData(DateTime.Now);      
  Binding myBinding = new Binding("MyDataProperty");
  myBinding.Source = myDataObject;
  myText.SetBinding(TextBlock.TextProperty, myBinding);
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Converting DataOverview
Used when data doesn’t match between bindings create a conversion class
When to use
Culture changes needed
Different View of data then native storage
 Incompatible data types between target and source
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Converting Data Out-of-Box Converters
Contained in the System.Windows.Controls namespace
BooleanToVisibilityConverter 
Converts True/False to Visible, Hidden or Collapsed
BorderGapMaskConverter
Represents a converter that converts the dimensions of a GroupBox control 
into a VisualBrush
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Data Templates Overview
Makes it easy to put content with data
Easy to define visual styles for data
Reusable and modifiable
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❑Styles
❏ The .NET framework provides several strategies to personalize and customize the appearance of an 
application.
❏ Style gives uniformity to our application and improves user UI experience.
❏ Styles provide us the flexibility to set some properties of an object and reuse these specific settings across 
multiple objects for a consistent look. 
❏ In styles, you can set only the existing properties of an object such as Height, Width, Font size, etc. 
❏ Only default behavior of a control can be specified.
❏ Multiple properties can be added into a single style.
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❑Scenario
 As you can see in first image, Width and Height properties of 
each button is set.
 It is tedious to set property of each button like this to 
maintain uniformity.
 And this is not the case only for buttons as there will be many 
more elements. It is not feasible to give style like this.
 Rather what we can do is,  declare a style for particular 
element by setting properties of that control. Just like it is 
done in second image.
 Sounds more efficient. Right? Let’s see an example.
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❑Example

    
       
          
          
          
          
          
       
    
    
       
       
       
    
 
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❑Explanation
 Styles are defined in the resource dictionary and each style has a unique key identifier and a target type.
 Inside  you can see that multiple setter tags are defined for each property which will be included in 
the style.
 All of the common properties of each button are now defined in style and then the style are assigned to 
each button with a unique key by setting the style property through the StaticResource markup extension.
 The advantage of doing it like this is immediately obvious, we can reuse that style anywhere in its scope; 
and if we need to change it, we simply change it once in the style definition instead of on each element.
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❑Style Levels
Sr.No Levels & Description
1 Control Level Defining a style on control level can only be applied to that particular control. Given below is an example of a control level 
where the button and TextBlock have their own style.
2 Layout Level Defining a style on any layout level will make it accessible by that layout and its child elements only.
3 Window Level Defining a style on a window level can make it accessible by all the elements on that window.
4 Application Level Defining a style on app level can make it accessible throughout the entire application. Let’s take the same example, but 
here, we will put the styles in app.xaml file to make it accessible throughout application.
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Triggers
 A trigger basically enables you to change property values or take actions based on the value of a 
property.
 So, it allows you to dynamically change the appearance and/or behavior of your control without having 
to create a new one.
 Triggers are used to change the value of any given property, when certain conditions are satisfied.
 Triggers are usually defined in a style or in the root of a document which are applied to that specific 
control. 
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Types Of Triggers
 There are three types of triggers-
 Property Triggers
 Data Triggers
 Event Triggers
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Property Triggers
 In property triggers, when a change occurs in one property, it will bring either an immediate or an animated change in another 
property.
 For example, you can use a property trigger to change the appearance of a button when the mouse hovers over the button.
 
    
       
          
          
             
                
             
          
       
    
    
       
    
 
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Data Triggers
 A data trigger performs some actions when the bound data satisfies some conditions.
 For example, There is checkbox and label. When the checkbox is checked, it will change label’s foreground color to red.

    
       
       
          
             
                
                   
                      
                      
                   
                
             
          
       
    

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Event Triggers

 A data trigger performs some actions when the bound data 
satisfies some conditions.  
                            
checked, it will change label’s foreground color to red.
                            
                            
                       
                   
                    
                    
          
          
                    
                    
                   
                      
                         
                            
                            
                            
                            
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Thank You
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