I dont know what do you mean by default button,but you can disable button something as follows:
Button definition:
<asp:button id="btn" runat="server" text="Redirect" />
In Code Behind:
btn.Attributes.Add("onclick","return Redirectfunc();");
Write the following function in the head section of your page:
function Redirectfunc()
{
document.getElementById('btn').disabled = true;
window.location.href="http://www.google.com";
return true;
}
Regards.. :laugh: