C# Definition:

Structures TOKEN_GROUPS
    public struct TOKEN_GROUPS {
        public uint GroupCount;
        [MarshalAs(UnmanagedType.ByValArray)] public SID_AND_ATTRIBUTES[] Groups;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct SID_AND_ATTRIBUTES {
        public IntPtr Sid;
        public uint Attributes;
    }

VB Definition:

Enum Structures TOKEN_GROUPS
   TODO
End Enum

Notes:

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TOKEN_GROUPS TokenGroups = (TOKEN_GROUPS)Marshal.PtrToStructure(ptTokenGroups, typeof(TOKEN_GROUPS));