Auto ID ให้บันทึกเดือนเป็นเลข 2 หลักครับ เช่นเดือนกุมภาพันธ์ ก็บันทึก 02 ตอนนี้มันเก็บแค่ 2

Imports System.Data.SqlClient

Public Class AutoIDDate
    Inherits System.Web.UI.Page

    Dim objConn As SqlConnection
    Dim objCmd As SqlCommand
    Dim strConnString, strSQL As String

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

    Public Sub ConnectDB()

        strConnString = ConfigurationManager.ConnectionStrings("con").ConnectionString
        objConn = New SqlConnection(strConnString)

    End Sub

    Function ORID() As String

        ConnectDB()

        Dim iMAX As Integer = 1
        Dim intNum As String = Nothing

        strSQL = "SELECT MAX(RIGHT(RM_ID,5)) As RM_ID FROM RawMaterial_New"
        objCmd = New SqlCommand(strSQL, objConn)

        objConn.Open()
        If IsDBNull(objCmd.ExecuteScalar()) = True Then
            intNum = "OR" & CStr(Now.Year).Substring(2) & CStr(Now.Month) & "0000" & iMAX
        Else
            iMAX = objCmd.ExecuteScalar() + 1
        End If

        If iMAX <= 9 Then
            intNum = "OR" & CStr(Now.Year).Substring(2) & CStr(Now.Month) & "0000" & iMAX
        ElseIf iMAX <= 99 Then
            intNum = "OR" & CStr(Now.Year).Substring(2) & CStr(Now.Month) & "000" & iMAX
        ElseIf iMAX <= 999 Then
            intNum = "OR" & CStr(Now.Year).Substring(2) & CStr(Now.Month) & "00" & iMAX
        ElseIf iMAX <= 9999 Then
            intNum = "OR" & CStr(Now.Year).Substring(2) & CStr(Now.Month) & "0" & iMAX
        ElseIf iMAX <= 99999 Then
            intNum = "OR" & CStr(Now.Year).Substring(2) & CStr(Now.Month) & iMAX
        End If
        objConn.Close()
        Return intNum

    End Function

    Private Sub AddORID()

        Dim OrderID As String = Nothing

        OrderID = ORID()

        objCmd.CommandText = "INSERT INTO RawMaterial_New (RM_ID) "
        objCmd.CommandText += "VALUES ('" & OrderID & "')"
        objConn.Open()
        objCmd.ExecuteNonQuery()
        objConn.Close()

        MsgBox("บันทึกสำเร็จ")

    End Sub

    Protected Sub btn_Add_Click(sender As Object, e As EventArgs) Handles btnAdd.Click

        AddORID()

    End Sub

End Class