In this article I will explain with an example, how to check whether CheckBox is checked or not in ASP.Net using C# and VB.Net.
When the Button is clicked, the status of CheckBox i.e. whether the CheckBox is checked (selected) or unchecked (unselected) is displayed using JavaScript Alert Message Box with C# and VB.Net.
HTML Markup
The following HTML Markup consists of a CheckBox and a Button. The Button has been assigned an OnClick event handler.
<asp:CheckBox ID="chkPassport" Text="Do you have Passport?" runat="server" />
<br />
<br />
<asp:Button ID = "btnCheck" Text="Check" runat="server" OnClick = "ButtonClicked" />
Checking whether CheckBox is checked or not in ASP.Net using C# and VB.Net
Inside the ButtonClicked event handler, a JavaScript Alert Message Box will be displayed which displays whether the CheckBox is checked (selected) or unchecked (unselected).
C#
protected void ButtonClicked(object sender, EventArgs e)
{
if (chkPassport.Checked)
{
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('CheckBox checked.');", true);
}
else
{
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('CheckBox not checked.');", true);
}
}
VB.Net
Protected Sub ButtonClicked(ByVal sender As Object, ByVal e As EventArgs)
If chkPassport.Checked Then
ClientScript.RegisterStartupScript(Me.GetType(), "alert", "alert('CheckBox checked.');", True)
Else
ClientScript.RegisterStartupScript(Me.GetType(), "alert", "alert('CheckBox not checked.');", True)
End If
End Sub
Screenshot
![Check whether CheckBox is checked or not in ASP.Net using C# and VB.Net]()
Demo
Downloads
