Calling Javascript from an UpdatePanel

You've probably used ClientScript.RegisterStartupScript in your ASP.NET application and it works just fine. However, if you try it within an UpdatePanel control, you would notice that it simply doesn't execute.

The solution to this problem is to use ScriptManager.RegisterStartupScript instead. You can call it like so:
ScriptManager.RegisterStartupScript(updatePanel1, updatePanel1.GetType(), "key", "alert('My script');", true);