Simple proof that GUID is not unique [closed]

Answer 1

Here's a nifty little extension method that you can use if you want to check guid uniqueness in many places in your code.

internal static class GuidExt
{
    public static bool IsUnique(this Guid guid)
    {
        while (guid != Guid.NewGuid())
        { }
        return false;
    }
}

To call it, simply call Guid.IsUnique whenever you generate a new guid...

Guid g = Guid.NewGuid();
if (!g.IsUnique())
{
    throw new GuidIsNotUniqueException();
}

...heck, I'd even recommend calling it twice to make sure it got it right in the first round.