Event Handling in windows programming using C# | How To Add Events at run time in windows application controls using C#.Net and VB.Net

Windows application event handling is used to perform different type of operation like click event, mouse click events and many more. So in this article I will show you how you can dynamically add the different events on your button control.

In this I have covered mouse event and button click event. In this I have used C#.Net, But I will provide code for VB.Net also.

Some of my previous c# articles are as follows: Syntax For Switch In C#.Net and VB.Net , Merge two datatables in C#.Net and VB.Net | How to merge multiple datatables using C#.Net , Random Number Generator C# , How to show error message in c# windows application | How to show Error & Warning Message Box in .NET.

So here is the code to add event at run time in your button.

public Form1()         {             InitializeComponent();             //mouse down event             this.button1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.OnMouseDown);             //mouse move event             this.button1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.OnMouseMove);             //button click event             this.button1.Click += new System.EventHandler(this.OnButtonclick);         }

The above written piece of code is used for adding mousedown, mousemove and button click event of the button.

So here is the complete code

C#.Net

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace Eventhandler {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();             //mouse down event             this.button1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.OnMouseDown);             //mouse move event             this.button1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.OnMouseMove);             //button click event             this.button1.Click += new System.EventHandler(this.OnButtonclick);         }         public void OnMouseDown(object sender, System.Windows.Forms.MouseEventArgs e)         {             lblmessage1.Text = "Mouse Down Event Occur";         }         public void OnMouseMove(object sender, System.EventArgs  e)         {             lblmessage.Text = "Mouse Move Event Occur";         }         public void OnButtonclick(object sender, System.EventArgs e)         {             lblmessage2.Text = "Click Event Occur";         }     } }

VB.Net

Imports System.Collections.Generic Imports System.ComponentModel Imports System.Data Imports System.Drawing Imports System.Linq Imports System.Text Imports System.Windows.Forms Namespace Eventhandler     Partial Public Class Form1         Inherits Form         Public Sub New()             InitializeComponent()             'mouse down event             Me.button1.MouseDown += New System.Windows.Forms.MouseEventHandler(AddressOf Me.OnMouseDown)             'mouse move event             Me.button1.MouseMove += New System.Windows.Forms.MouseEventHandler(AddressOf Me.OnMouseMove)             'button click event             Me.button1.Click += New System.EventHandler(AddressOf Me.OnButtonclick)         End Sub         Public Overloads Sub OnMouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)             lblmessage1.Text = "Mouse Down Event Occur"         End Sub         Public Overloads Sub OnMouseMove(ByVal sender As Object, ByVal e As System.EventArgs)             lblmessage.Text = "Mouse Move Event Occur"         End Sub         Public Sub OnButtonclick(ByVal sender As Object, ByVal e As System.EventArgs)             lblmessage2.Text = "Click Event Occur"         End Sub     End Class End Namespace

Now run the application

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