Mega Code Archive
Use the AutoPostBack property to post the form to the server automatically when the check box is checked or unchecked
<![CDATA[
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void chkNewsletter_CheckedChanged(object sender, EventArgs e)
{
lblResult.Text = chkNewsletter.Checked.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>CheckBox AutoPostBack</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:CheckBox
id="chkNewsletter"
Text="Receive Newsletter?"
AutoPostBack="true"
OnCheckedChanged="chkNewsletter_CheckedChanged"
Runat="server" />
<hr />
<asp:Label
id="lblResult"
Runat="server" />
</div>
</form>
</body>
</html>
]]>