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If you like the old-style GUIDs that are generated in sequential order and contain the machine's MAC address, try UuidCreateSequential.

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static extern int UuidCreate(ref UUID id);

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Declare Function UuidCreate Lib "rpcrt4.dll" (ByRef id As UUID) As Integer

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rc = UuidCreate(ref id);

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     rc = UuidCreate(ref id);

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Documentation

UuidCreate @msdn on MSDN

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static extern int UuidCreateSequential(out Guid guid);

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Declare Function UuidCreateSequential Lib "rpcrt4.dll" (ByRef id As Guid) As Integer

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Microsoft changed the UuidCreate function so it no longer uses the machine's MAC address as part of the UUID. Since CoCreateGuid calls UuidCreate to get its GUID, its output also changed. If you still like the GUIDs to be generated in sequential order (helpful for keeping a related group of GUIDs together in the system registry), you can use the UuidCreateSequential function.

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UuidCreateSequential generates sequential GUIDs like these:

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Here is a summary of the differences in the output of UuidCreateSequential:

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static Guid UuidCreateSequential()

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   int hr = UuidCreateSequential(out g);

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       ("UuidCreateSequential failed: " + hr);

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   code = UuidCreateSequential(myId)

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     Console.WriteLine("UuidCreateSequential failed: {0}", code)

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Documentation

[UuidCreateSequential] on MSDN

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static extern int UuidCreateSequential(out Guid guid);

.

Declare Function UuidCreateSequential Lib "rpcrt4.dll" (ByRef id As Guid) As Integer

.

Microsoft changed the UuidCreate function so it no longer uses the machine's MAC address as part of the UUID. Since CoCreateGuid calls UuidCreate to get its GUID, its output also changed. If you still like the GUIDs to be generated in sequential order (helpful for keeping a related group of GUIDs together in the system registry), you can use the UuidCreateSequential function.

.

UuidCreateSequential generates sequential GUIDs like these:

.

Here is a summary of the differences in the output of UuidCreateSequential:

.

static Guid UuidCreateSequential()

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   int hr = UuidCreateSequential(out g);

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       ("UuidCreateSequential failed: " + hr);

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   code = UuidCreateSequential(myId)

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     Console.WriteLine("UuidCreateSequential failed: {0}", code)

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Documentation

[UuidCreateSequential] on MSDN

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DynamicLoader

RPCRT4/UuidCreateSequential