With very limited information that you have provided, hope you have added the following in your code :
- You might be using
AJAX
in your
ASP.NET
application, so make sure you have added
ScriptManager
in the .aspx file.
- Add
Triggers
to your
UpdatePanel
for each control like this :
<asp:UpdatePanel ID="myPanel" runat="Server" xmlns:asp="#unknown">
<contenttemplate>
<!-- Declare your controls here -->
</contenttemplate>
<triggers>
<asp:AsyncPostBackTrigger ControlID="giveYourControlID" EventName="Checked" />
</triggers>
With this your event handling will be taken care of.
Hope it helped!