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Event Handler for library

Posted By:      Posted Date: September 15, 2010    Points: 0   Category :SharePoint
Hi, Hi, I have a library with these fields(mailid,cost,mailid2), i need a validation of mailIds if already existing  mails three time  I need a validation for new request , I have user interface in InfoPath 201 0 , workflow SharePoint designer 2010 , everything is working now I need a validation mail id , if mail is already existing three time ,how to count mails ids individual mails how to i count Regards

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