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Brady Kelly wrote:

Subtle indeed. I never use char literals unless absolutely necessary. A one char string is a tad expensive in some cases, but surely not in this one.

private const string ObjectRefGuidFormat = "{0}{1:_0}{2:_0}";

// ...

// E.g. "1_2" or "1_2_3".
string objectRefGuid = string.Format(ObjectRefGuidFormat,
    objectRef.ObjectTypeId,
    objectRef.ObjectId,
    objectRef.VersionNumber > 0 ? objectRef.VersionNumber.ToString() : null);