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The GUID is really just a number. The hyphens show you how the various components are broken down but aren't really part of the number. It's like an IP address - you can store a 32-bit number, or you can store a string with dots in it, they are equivalent.
To Generate a GUID in Windows 10 with PowerShell, Type or copy-paste the following command: [guid]::NewGuid() . This will produce a new GUID in the output. Alternatively, you can run the command '{'+[guid]::NewGuid(). ToString()+'}' to get a new GUID in the traditional Registry format.
No it won't have an underscore. If you are processing a guid as a string there are various parameters you can add to Guid.
Theoretically, no, they are not unique. It's possible to generate an identical guid over and over.
Note that you are talking about the (canonical) string representation of a Guid. The Guid itself is actually a 128-bit integer value.
You can use the "N" specifier with the Guid.ToString(String) overload.
Guid.NewGuid().ToString("N");
By default letters are lowercase. A Guid with only uppercase letters can only be achieved by manually converting them all to uppercase, example:
Guid.NewGuid().ToString("N").ToUpper();
A guid with only either letter or digits makes no sense. A guid string representation is hexadecimal, and thus will always (well most likely) contain both.
Guid.NewGuid().ToString().Replace("-", string.Empty)
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