Error on using session

[Mongz]

Hi once again
Im trying to use sessions, im passing a value from login page and using it on another page, now i recieve this error "Object reference not set to an instance of an object."

here im passing it
Session["UserName"] = Login1.UserName;

then accessing on different page like this
username = Session["UserName"].ToString();

Please help me on how can i access it.

[jatin24]

Are you sure that the Username in Login1.Username is a string? convert it to string just to be safe.

[sknake]

Test the value before you use it

if (Session["UserName"] != null)
  userName = Convert.ToString(Session["UserName"]);