Where I should declare a session variable in asp.net

Question

I am building a Asp.net Application. I need to save a HashTable in a session.

At page load i am writing

 protected void Page_Load(object sender, Even         


        

Answer 1

test if it exists first

 protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
       if(Session["AttemptCount"] == null)
       {
          Session["AttemptCount"]=new Hashtable(); //Because of this line.
       }
    }   
}

though the session_start is better, you only need to uses it on one page but you can create it for each session.