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

I seen that link but it has been made in Sharepoint 2007.i am not able to understand and implement it.i need a simple way to implement it. can u please help me out to implement it

User should be able to personalise his own themes and when he login he should be able to see his themes and background images in Sharepoint 2010.please help

Heyy thats what iam saying that i dont know these new rating system. I dont know about points system.just now i seen that if we down vote then points gets reduced..

Heyyy i didnt know the Voting process and about the voting points.i will rate you high as if u give correct solution to the problem.sorry

How to make a sharepoint page accessible to all Users then add an option to login to Users and how to customize themes based on User login. User should have option to set his own themes in site.

OK.But users who has Contribute permissions will be added directly to members group.

No might be you need to create a timer job to update all users to List from AD

Yes group name will appear with site name and Member group,visitors,owners