How to manage session values in particular page

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C#

C#4.0

I have to know that is there better way to handle the session values in particular page without assgining them null or string.empty ,i am creating dynamic controls in my page but if in certain cases if user create the controls and it will move to another page then he will enable to create controls again as i am holding there values in session due to certain reason ,but if i dont submit the page and then move to another page and come again and try to submit i got an error as my session holding pervious values.
Thanks