This keeps coming up on the forums, probably because it's pretty counterintuitive. What do you think will happen if I click the button in the following example? <% @ Page Language ="C#" %> < script runat ="server"> protected void sleep( object sender, EventArgs e) { System.Threading. Thread .Sleep(5000); } < html xmlns ="http://www.w3.org/1999/xhtml"> < body > < form id ="form1" runat ="server"> < asp : ScriptManager ID ="ScriptManager1" runat ="server" /> < asp : UpdatePanel ID ="UpdatePanel1" runat ="server" UpdateMode ="Conditional"> < ContentTemplate > <% = DateTime...(read more)