Add Dynamic CheckBox Handle CheckedChanged Event ASP.NET

Add Dynamic CheckBox And Handle CheckedChanged Event In ASP.NET 2.0,3.5,4.0 Using C# And VB.NET. Several times we need to add dynamic controls in asp.net application using code behind.

In this post i am going to describe how to add dynamic CheckBox and assign CheckChanged event in asp.net using C# and VB.NET


To add a checkbox when page is loaded we need to write this code in page_Load Event

C# Code Behind

public partial class _Default : System.Web.UI.Page 
{
    CheckBox chkDynamic;
    protected void Page_Load(object sender, EventArgs e)
    {
        chkDynamic = new CheckBox();
        chkDynamic.ID = "chkExample";
        chkDynamic.Text = "Check / Uncheck";
        chkDynamic.AutoPostBack = true;
        chkDynamic.CheckedChanged += new EventHandler
                           (chkDynamic_CheckedChanged);
        this.Form.Controls.Add(chkDynamic);
    }

    protected void chkDynamic_CheckedChanged
                 (object sender, EventArgs e)
    {
        if (chkDynamic.Checked)
            lblMessage.Text = "you checked the checkbox";
        else if (!chkDynamic.Checked)
            lblMessage.Text = "checkbox is not checked";
    }
}

VB.NET Code Behind

Public Partial Class _Default
    Inherits System.Web.UI.Page
    Private chkDynamic As CheckBox
    Protected Sub Page_Load
    (ByVal sender As Object, ByVal e As EventArgs)
        chkDynamic = New CheckBox()
        chkDynamic.ID = "chkExample"
        chkDynamic.Text = "Check / Uncheck"
        chkDynamic.AutoPostBack = True
        AddHandler chkDynamic.CheckedChanged, 
         AddressOf chkDynamic_CheckedChanged
        Me.Form.Controls.Add(chkDynamic)
    End Sub
    
    Protected Sub chkDynamic_CheckedChanged
    (ByVal sender As Object, ByVal e As EventArgs)
        If chkDynamic.Checked Then
            lblMessage.Text = "you checked the checkbox"
        ElseIf Not chkDynamic.Checked Then
            lblMessage.Text = "checkbox is not checked"
        End If
    End Sub
End Class

Hope this helps

Read other articles on checkboxes:
Edit or update multiple records/rows in gridview with checkbox
Delete multiple rows records in Gridview with checkbox and confirmation