Dynamically add session variables

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C#3.0

C#

Hi,

I am using VS 2008 for developing the webportal in which user can select various criteria's
for searching(like company, location..from the list displayed in the left panel of the website ) and every time the user chooses the criteria must update the panel and display the selected criteria with an "Ignore" button(clicking on which will ignore the criteria while performing the search)and this must be maintained in various post backs.

I wanted to know the best way to achieve the above functionality.

Thanks in advance,

Vasanth