Dear All, I have Custom list. I created coloum called "IndexNo" which i dont wanna be duplicate when user enter the data. How can i make it? Its mean, i want to create colomn which user cant enter same index number again & again. Regards lasantha

You can use this codeplex project http://features.codeplex.com/ that add an information policy to manage unicity on a column. You could also use event receivers to achieve this (block duplicate records). Check out this post that discusses the same question : http://social.technet.microsoft.com/Forums/en-US/sharepointadmin/thread/869a4ce5-2d55-40d9-9071-5795025c94a8 Florin DUCA - MCSE 2003 +Sec,MCTS conf/dev WSS3/MOSS, MCITP/MCPD SP 2010, MCPD ASP.Net 3.5, MCTS ISA 2006 - Logica Business Consulting, France

i solve this solution in my previous post. http://social.technet.microsoft.com/Forums/en-US/sharepointgeneral/thread/7ff4730c-b0c1-4d13-8134-2449ef4525ab

Thank you lots, Its work. But I am getting error when i create same record (IndexNo) ________________________________________________________ Server Error in '/' Application. Column 'Serial Number' must have a unique value within the list. Description: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. ------------------------------------------------------------------------------------- Regards lasantha

Well it's the standard SharePoint Error page. It should be a little more user friendly if you re-enable custom errors (I guess you disabled custom error for debugging).Florin DUCA - MCSE 2003 +Sec,MCTS conf/dev WSS3/MOSS, MCITP/MCPD SP 2010, MCPD ASP.Net 3.5, MCTS ISA 2006 - Logica Business Consulting, France