AjaxControlToolkit.ToolkitScriptManager.CombineScriptsHandlerUrl’ is obsolete: ‘Please register AjaxControlToolkit.CombineScriptsHandler http handler instead.

When you use AjaxControlToolkit.ToolkitScriptManager and building/validating an asp.net application is showed the error message

AjaxControlToolkit.ToolkitScriptManager.CombineScriptsHandlerUrl’ is obsolete: ‘Please register AjaxControlToolkit.CombineScriptsHandler http handler instead.

and in the page is present this

<ajaxToolkit:ToolkitScriptManager ID="ScriptManager1" 
  runat="server" CombineScriptsHandlerUrl="~/CombineScriptsHandler.ashx" />

you can fix by removing the attribute  CombineScriptsHandlerUrl=”~/CombineScriptsHandler.ashx” .

thus became

<ajaxToolkit:ToolkitScriptManager ID="ScriptManager1" runat="server"  />

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