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public static class Storage
{
     public static void SessionAdd<T>(string label, T value)
     {
          if(!string.IsNullOrEmpty(label))
               HttpContext.Current.Session.Add(label, value);
     }

     public static void SessionModify<T>(string label, T value)
     {
          if(HttpContext.Current.Session[label] != null)
          {
               HttpContext.Current.Session[label] = value;
               return;
          }

          SessionAdd(label, value);              
     }

     public static T SessionModifyAndReturn<T>(string label, T value) where T : class, new()
     {
          var content = new  T();
          if(HttpContext.Current.Session[label] != null)
               HttpContext.Current.Session[label] = value;
          else { SessionAdd(label, value); }

          content = value;
          return content;
     }           
}