you can't assign a method to a session..., you can put the data returned from that method into session,

supose ur method is returning some string values which is retrieved from database..,you can use like this

private string GetValue()

{

 ....//some database stuff...

return "asp.net";

}

Adding to session

Session["somekey"] = GetValue()

Reading from session

string  strValue = Session["somekey"].ToString();