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     /// A GUID string that the IIDFromString function returns

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  // String-ized GUID as returned by IIDFromString().

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static extern int IIDFromString([MarshalAs(UnmanagedType.LPWStr)] string lpsz,

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static extern Guid IIDFromString(string lpsz);

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    static extern int IIDFromString(string lpsz, out Guid lpiid);

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       int    result = IIDFromString(iid, out g);

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    static extern Guid IIDFromString(string lpsz);

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       Guid   g = IIDFromString(iid);

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Documentation

[IIDFromString] on MSDN

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      // String-ized GUID as returned by IIDFromString().