Two form tags in asp.net page causes issues

I have a search box which performs a search on any given keyword. It was working fine until another programmer added two form tags to the page which causes the url to load additional details while passing query string. When I comment any one开发者_开发百科 of the tag, the query string is passed correctly. Can you please help with your valuable input?

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There should be one Form tag in the page. Please check below link:

http://msdn.microsoft.com/hi-in/magazine/cc163736%28en-us%29.aspx