Here is the full code
<asp:button id="Button1" runat="server" onclick="Button1_Click" text="Button" xmlns:asp="#unknown" />
<input type="hidden" name ="__EVENTTARGET" value =""/>
<script type="text/javascript">
function __doPostBack(eventTarget, eventArgument) {
var frm = document.forms[0];
document.getElementById("__EVENTTARGET").value = eventTarget;
frm.submit();
}
__doPostBack('Button1');
</script>
In code behind
protected void Page_Load(object sender, EventArgs e)
{
if (Request["__EVENTTARGET"] == "Button1")
{
Button1_Click(this, null);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
}
Hope this helps
cheers