UpdatePanel inside Dropdownlist not Working on Selected Index changed Event
-
I have a Visual Webpart in Sharepoint.Iam trying to use updatepanel inside Dropdownlist with autopostback to true.But it gives error as Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Win64; x64; Trident/4.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E) Timestamp: Thu, 21 Mar 2013 12:12:42 UTC Message: Sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. Line: 5 Char: 62099 Code: 0 URI: http://eyapst01:10573/ScriptResource.axd?d=1au3UwjPQmarAdQfqPk4LfQ2gwWhQlXcW8AFDi4fE6Xu4KfduAvHz52\_RkVAOfkPdd7foB28JyHoT9LGBXWt6s\_PpDKLhipyP-ZhzM1z3ptLvMfLmZELec5HG6mTDBmBLWScPFZjNAfr2hAt1wRP-PXXRK01&t=fffffffff9d85fa6