[REPOST] To Pass ID from the table

cmd.CommandType = CommandType.Text;
string str = "Select ID from Team_Registration where UserName= '" + Session["New"] + "'";
int N = Convert.ToInt32(str);
cmd.Parameters.AddWithValue("@Name", txtName.Text.ToString());
cmd.Parameters.AddWithValue("@Mobile", txtMobile.Text.ToString());
cmd.Parameters.AddWithValue("@Address", txtAddress.Text.ToString());
cmd.Parameters.AddWithValue("@UserId", N);
cmd.ExecuteNonQuery();