UpdatePanel not working with ToolkitScriptManager

When u use scriptmanager with updatepanel then it's fine.

But when u add ToolkitScriptManager for any ajax control like extender, then page wont run because there are two scriptmanager.

So if u delete scriptmanager then UpdatePanel will not work with ToolkitScriptManager.

To resolve this issue, only use ToolkitScriptManager because it has scriptmanager as parent.

make following changes in your code. just add property "ChildrenAsTriggers="true""

lt&&;@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" % gt&&;

...........

lt&&;asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" ChildrenAsTriggers="true" gt&&;

lt&&;/asp:ToolkitScriptManagergt&&;