run ไม่ผ่าน ช่วยดูให้หน่อยค่ะ คือว่าทำ visual c# 2008 กับ MS Access 2003

private void btOK_Click(object sender, EventArgs e)
        {
                

                StringBuilder sb = new StringBuilder();
                sb.Append("SELECT User,Pass");
                sb.Append(" FROM Login");
                sb.Append(" WHERE (User=@User)");
                sb.Append(" AND (Pass=@Pass)");
                string login = sb.ToString();
                OleDbCommand com = new OleDbCommand(login,mycon);
                com.Parameters.Clear();
                com.Parameters.Add("@User", SqlDbType.Text).Value = maskedTextBox1.Text.Trim();
                com.Parameters.Add("@Pass", SqlDbType.Text).Value = maskedTextBox2.Text.Trim();
                OleDbDataReader dr = com.ExecuteReader();
                    if (dr.HasRows)
                    {
                        dr.Read();
                        Menu m = new Menu();
                        dr.Close();
                        m.Show();
                        this.Hide();
                    }
                    else
                    {
                        MessageBox.Show("Invail");
                        dr.Close();
                    }
            }