Auto ID : ผมจะย่อ Code นี้ให้สั้นอย่างไรครับ ช่วยแนะนำด้วยครับ

Imports System.Data.SqlClient

Public Class DigidandyyMMandNumber1
    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 CreateID() As String

        ConnectDB()

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

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

        objConn.Open()
        If IsDBNull(objCmd.ExecuteScalar()) = True Then
            'intNum = "OR" & CStr(Now.Year).Substring(2) & "0000" & iMAX
            intNum = "ID" & CStr(Format(Now.Date, "yyMM")) & "0000" & iMAX
        Else
            iMAX = objCmd.ExecuteScalar() + 1
        End If

        If iMAX <= 9 Then
            intNum = "ID" & CStr(Format(Now.Date, "yyMM")) & "0000" & iMAX
        ElseIf iMAX <= 99 Then
            intNum = "ID" & CStr(Format(Now.Date, "yyMM")) & "000" & iMAX
        ElseIf iMAX <= 999 Then
            intNum = "ID" & CStr(Format(Now.Date, "yyMM")) & "00" & iMAX
        ElseIf iMAX <= 9999 Then
            intNum = "ID" & CStr(Format(Now.Date, "yyMM")) & "0" & iMAX
        ElseIf iMAX <= 99999 Then
            intNum = "ID" & CStr(Format(Now.Date, "yyMM")) & iMAX
        End If

        objConn.Close()
        Return intNum

    End Function

    Private Sub AddID()

        Dim AutoID As String = Nothing

        AutoID = CreateID()

        objCmd.CommandText = "INSERT INTO AutoID (ID) "
        objCmd.CommandText += "VALUES ('" & AutoID & "')"
        objConn.Open()
        objCmd.ExecuteNonQuery()
        objConn.Close()

        MsgBox("บันทึกสำเร็จ")

    End Sub

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

        AddID()

    End Sub

End Class