GUID (Structures)
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A made-up class that can be used when you need a pointer to a GUID and when you need to be able to pass null.

C# Definition:

public class GuidClass
    public Guid TheGuid;

VB Definition:

Structure GuidClass
   Public Guid TheGuid
End Structure


Instead of this, you could choose to define such a parameter as an array of System.Guids and only ever use the first element.

GuidClass on MSDN