Generate a GUID

The following examples illustrate how to generate a GUID:

In C#:

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//Guid type is available in the System namespace
//So supply a `using System;` as needed.
var operationId = Guid.NewGuid();

In PowerShell:

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 > [Guid]::NewGuid()

Guid
----
e6a24aed-4377-4bd4-b535-40903d9d62af