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Dim conn As New OracleConnection(oradb)
        Dim sb As New System.Text.StringBuilder

        If txtEmployeeID.Text.Trim = "" Then
            txtEmployeeID.Focus()
            Exit Sub
        End If

        Try
            conn.Open()

            Dim sql As String = "SELECT MANAGER_ID FROM DEPARTMENTS WHERE DEPARTMENT_ID = " & cbDepartment.SelectedValue
            Dim cmd As New OracleCommand(sql, conn)
            cmd.CommandType = CommandType.Text

            '### BEGIN ### ใช้สำหรับค้นหา MANAGER_ID จากตาราง DEPARTMENTS
            Dim MANAGER_ID As Integer
            Dim dr As OracleDataReader = cmd.ExecuteReader()
            dr.Read()
            MANAGER_ID = dr.Item("MANAGER_ID")    ' retrieve by column name
            dr.Close()
            '### END ### 

            '### BEGIN ### ใช้สำหรับแปลงค่าข้อมูลให้อยู่ในรูปแบบวันที่ 
            Dim HireDate As DateTime = Convert.ToDateTime(dtHiredate.Value)
            '### END ### 

            sb.Remove(0, sb.Length) ' clear stringBuilder

            sb.Append("INSERT INTO ")
            sb.Append(" EMPLOYEES(EMPLOYEE_ID, FIRST_NAME, LAST_NAME, EMAIL, PHONE_NUMBER, HIRE_DATE, JOB_ID, SALARY, COMMISSION_PCT, MANAGER_ID, DEPARTMENT_ID)")
            sb.Append(" VALUES(:EMPLOYEE_ID, :FIRST_NAME, :LAST_NAME, :EMAIL, :PHONE_NUMBER, :HIRE_DATE, :JOB_ID, :SALARY, :COMMISSION_PCT, :MANAGER_ID, :DEPARTMENT_ID)")

            sql = sb.ToString

            cmd.CommandText = sql

            With cmd
                .Parameters.Clear()
                .Parameters.Add(":EMPLOYEE_ID", OracleDbType.Int32).Value = txtEmployeeID.Text.Trim
                .Parameters.Add(":FIRST_NAME", OracleDbType.Varchar2).Value = txtFname.Text.Trim
                .Parameters.Add(":LAST_NAME", OracleDbType.Varchar2).Value = txtLname.Text.Trim
                .Parameters.Add(":EMAIL", OracleDbType.Varchar2).Value = txtEmail.Text.Trim
                .Parameters.Add(":PHONE_NUMBER", OracleDbType.Varchar2).Value = txtTelephone.Text.Trim
                .Parameters.Add(":HIRE_DATE", OracleDbType.Date).Value = HireDate
                .Parameters.Add(":JOB_ID", OracleDbType.Varchar2).Value = cbJobs.SelectedValue
                .Parameters.Add(":SALARY", OracleDbType.Decimal).Value = txtSalary.Text.Trim
                If txtCommission.Text.Length = 0 Then
                    .Parameters.Add(":COMMISSION_PCT", OracleDbType.Decimal).Value = Nothing  ' กรณีไม่มีค่า Commission
                Else
                    .Parameters.Add(":COMMISSION_PCT", OracleDbType.Decimal).Value = txtCommission.Text.Trim
                End If                
                .Parameters.Add(":MANAGER_ID", OracleDbType.Int32).Value = MANAGER_ID
                .Parameters.Add(":DEPARTMENT_ID", OracleDbType.Int32).Value = cbDepartment.SelectedValue

                If .ExecuteNonQuery() = 1 Then
                    MessageBox.Show("เพิ่มข้อมูลพนักงานเรียบร้อย", "Add new Completed...", MessageBoxButtons.OK, MessageBoxIcon.Information)
                Else ' เท่ากับ ศูนย์ คือ ทำงานไม่สำเร็จ
                    MessageBox.Show("ไม่สามารถเพิ่มข้อมูลพนักงานได้", "Problem...", MessageBoxButtons.OK, MessageBoxIcon.Information)
                End If

            End With

        Catch ex As Exception
            MessageBox.Show(ex.Message.ToString())
        Finally
            conn.Dispose()
        End Try