implementing interfaces during VB to VB.NET class migration

I'm migrating the CenterSnap.cls from its vb version to vb.NET and I'm confused about the following 2 errors after I import the vb6 project to VS 2008.

Err 1

Imports System.Runtime.InteropServices
Imports ESRI.ArcGIS.esriSystem

<System.Runtime.InteropServices.ProgId("StackMap.CenterSnap")> 
Public Class CenterSnap
    Implements ES开发者_C百科RI.ArcGIS.Editor.ISnapAgent
    Implements ESRI.ArcGIS.esriSystem.IPersistVariant ' <<<<ERROR 1

Error 1 Class 'CenterSnap' must implement 'ReadOnly Property ID As UID' for interface 'ESRI.ArcGIS.esriSystem.IPersistVariant'. Implementing property must have matching 'ReadOnly' or 'WriteOnly' specifiers. C:\Projects\VB_ActiveX_dll\StackMap\StackMap\CenterSnap.vb 9 16 StackMap

Err 2

Private ReadOnly Property IPersistVariant_ID() As ESRI.ArcGIS.esriSystem.IUID _
Implements ESRI.ArcGIS.esriSystem.IPersistVariant.ID '<<<< ERROR 2

Error 2 'IPersistVariant_ID' cannot implement 'ID' because there is no matching property on interface 'ESRI.ArcGIS.esriSystem.IPersistVariant'. C:\Projects\VB_ActiveX_dll\StackMap\StackMap\CenterSnap.vb 16 94 StackMap

        Get
            Dim pID As New ESRI.ArcGIS.esriSystem.UID
            pID.Value = "CenterSnap.clsCenterSnap"
            IPersistVariant_ID = pID

        End Get

Why is the Implements ESRI.ArcGIS.esriSystem.IPersistVariant not implementing? I have the ESRI.esriSystem referenced in the project.

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From the looks of the code, the error says it is expecting an UID property, but your IPersistVeriant_ID property is returning an IUID.

I'm not familiar with what an ESRI.ArcGIS thing is, but it looks like UID and IUID are not the same thing.