Dataset Value retrival

string u_login = "", u_email = "", u_id = "", u_fname = "", u_lname = "";
DataView dv1 = ds1.Tables[0].DefaultView;
dv1.RowFilter = "user_id=" + id;
DataTable dt1 = dv1.ToTable();
u_login = dt1.Rows[0]["user_login"].ToString();
u_email = dt1.Rows[0]["user_email"].ToString();
u_id = dt1.Rows[0]["user_id"].ToString();
u_fname = dt1.Rows[0]["user_first_name"].ToString();
u_lname = dt1.Rows[0]["user_last_name"].ToString();