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According to the MSDN documentation, http://msdn.microsoft.com/en-us/library/system.guid.tryparse.aspx and http://msdn.microsoft.com/en-us/library/system.guid.tryparseexact.aspx, Guid.TryParse and Guid.TryParseExact should not throw exceptions when the input string is null. Mono incorrectly throws ArgumentNullException exceptions in the try parse methods. To reproduce, run the following code:
bool success = Guid.TryParse(null, out guid);
success should be false and guid should be equal to Guid.Empty.
Mono throws an ArgumentNullException for input.
Submitted pull request with fix, https://github.com/mono/mono/pull/416