Invalid PostBack or callback argument.

[Argumentexception: Invalid PostBack or callback argument. event validation is enabled using <pages enableeventvalidation = "true"/> 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.]
System. Web. UI. clientscriptmanager. validateevent (string uniqueid, string argument) + 367
System. Web. UI. Control. validateevent (string uniqueid, string eventargument) + 83
System. Web. UI. webcontrols. Button. raisepostbackevent (string eventargument) + 52
System. Web. UI. webcontrols. Button. system. Web. UI. ipostbackeventhandler. raisepostbackevent (string eventargument) + 31
System. Web. UI. Page. raisepostbackevent (ipostbackeventhandler sourcecontrol, string eventargument) + 32
System. Web. UI. Page. raisepostbackevent (namevaluecollection postdata) + 72
System. Web. UI. Page. processrequestmain (Boolean includestagesbeforeasyncpoint, Boolean includestagesafterasyncpoint) + 3843

 

Error Solution

1. Add in <pages enableeventvalidation = "false"/> Web. config

2. Page. clientscript. registerforeventvalidation (this. uniqueid );

Reference

Http://forums.asp.net/t/922994.aspx