code of return url like:
if (Convert.ToString(Session["login_nm"]) != null && Convert.ToString(Session["login_nm"]) != "")
{
lbl_name.Text = (Session["login_nm"]).ToString();
lbl_msg.Text = "Thank You for shoping with us.";
}
when pay pal return thank u page
then Session["login_nm"] value null
how to get it