[VB.NET]VB6写的DLL在vb.net中怎么调用啊 谢谢

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VB6写的DLL在vb.net中怎么调用啊 谢谢
使用VB6编写的DLL在VB中调用如下：

dim Myobj as new CMD_LAB.MD5
dim RetStr as string
RetStr =Myobj.GetMD5( "生成特别的MD5编码 ")

.Net 中想继续使用这个DLL。不希望通过 "引用 "来调用！

Imports System.Reflection

Dim Mtypec As Type
Dim Mobject As Object

Mtypec = Type.GetTypeFromProgID( "CMD_LAB.MD5 ")

If Mtypec Is Nothing Then
Mobject = Nothing
Else
Mobject = Activator.CreateInstance(Mtypec)
RetStr = Mtypec.InvokeMember( "GetMD5 ", BindingFlags.InvokeMethod, Nothing, Mobject, ???)
End If

现有如下疑问：
1、怎么使用InvokeMember调用需要参数的方法？
2、怎么得到方法的返回值

谢谢
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