asp.net & windows nt login name

hey guys -

i've read a lot of people asking questions on this topic and i can't get any of their solutions to make sense to me.

right off, i'll ask - i have an asp.net website (c# backend). i'm trying to return the logged in user name (windows NT name) to my code. my IIS site is set up via anon auth.

is there any way that i can make this happen? here's a snippet that just returns an empty field for the username.

thanks guys!!

string userName = HttpContext.Current.User.Identity.Name.ToString(); 
        string[] username = new string[10];
        username = userName.Split('\\');
        userName = username[1].ToString();
        int wellid = 0;
        
        //open up connection to server
        String conString = GetConnectionString();
        TextBox1.Text = userName;
        if (Request.QueryString["add"] != null)
        {
            wellid = int.Parse(Request.QueryString["add"].ToString());
 
            try
            {
                SqlConnection connDB = new SqlConnection(conString);
                connDB.Open();
                SqlCommand cmdDB = connDB.CreateCommand();
 
                cmdDB.CommandText = "INSERT INTO MAP.USERSELECTION (userid, welloid) select '" + userName +
                            "'," + wellid;
                cmdDB.ExecuteNonQuery();
                connDB.Close();
                TextBox1.Text = "Item added to your list! You can close this browser!";
            }
            catch { }
        }

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