hai,
Sessions are used to store values on server temporary.for every user will have unique sessions values.usually session are mostly used for storing username and password..it ll get expire on particular time or when user logout his session in web application
you can find more on follwing site
refer this
http://msdn.microsoft.com/en-us/library/ms178581.aspx[
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Creating session in c#
Session["FirstName"] = FirstNameTextBox.Text;
Session["LastName"] = LastNameTextBox.Text;
Creating session in VB
Session("FirstName") = FirstNameTextBox.Text
Session("LastName") = LastNameTextBox.Text