สอบถามเรื่องการ insert mysql หน่อยครับทุกท่าน ภาษา c#

                //Mysql Database
                MySqlConnection objConn;
                MySqlCommand objCmd;
                string strConnString = null;
                string strSQL = null;

                strConnString = "Server=localhost;User Id=root; Password=123456; Database=database; Pooling=false";
                objConn = new MySqlConnection(strConnString);
                objConn.Open();

                    int intNumRows = 0;
                    strSQL = "SELECT COUNT(*) FROM member WHERE User = '" + Request.QueryString["User"] + "'";
                    objCmd = new MySqlCommand(strSQL, objConn);
                    intNumRows = Convert.ToInt32(objCmd.ExecuteScalar());
                    if (intNumRows > 0)
                    {
                        objCmd = new MySqlCommand("insert into member(namethai,tel) value (?snamethai,?stel)", objConn);
                        objCmd.Parameters.Add(new MySqlParameter("?snamethai", textbox1.Text));
                        objCmd.Parameters.Add(new MySqlParameter("?stel", textbox2.Text));
                        objCmd.ExecuteNonQuery();
                    }
                objConn.Close();
                objConn = null;