C#怎么连接SQL 2000

我用的是SQL 2005

try
            {
                SqlConnection conn = new SqlConnection("server=.;pwd = 'sun',user id = 'sa',database = db");

                conn.Open();

                SqlCommand cmd = new SqlCommand();

                = "INSERT INTO test(city,tq,wd) VALUES ('qq','" + YQ + "','" + WD + "')";

                cmd.Connection = conn;

                cmd.EndExecuteNonQuery();//这里提示错误，应该是数据库连接问题

                MessageBox.Show("数据添加成功!");

                conn.Close();
            }
            catch (SqlException E)
            {
                MessageBox.Show(E.Message);
            }