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user can only submit once or twice

Posted By:      Posted Date: September 20, 2010    Points: 0   Category :ASP.Net

My site has a comment box. Users can put their name, email and their comment, all fields can accept null. The comments submitted goes into a database.

I want to limit a user so that it can only submit a comment for let's say 30 minute interval or if it closes its browser.

I am using C#.

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