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You want to create multiple Microsoft Dynamics CRM users at the same time. Therefore, you create multiple worker threads, and each worker thread uses the service.Create(user) method, as shown in the following example.
systemuser user = new systemuser();service.Create(user);
However, if you run these threads on a computer that has multiple CPUs, you may receive the following error message:
0x80040237 Cannot insert duplicate key.
If you enable the Platform tracing function, you receive an error message that resembles the following:
CrmService.Create failed with an error "Restraint 'AKI_UserSettinsBase_TrackingTokenId' Unique KEY violation. Cannot import duplicate key.
This problem is fixed in the latest cumulative update rollup for Microsoft Dynamics CRM 4.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
949256 Microsoft Dynamics CRM 4.0 updates and hotfixes