.NET Short Unique Identifier

Question

I need a unique identifier in .NET (cannot use GUID as it is too long for this case).

Do people think that the algorithm used here is a good candidate or do you have

Answer 1

you can use

code = await UserManager.GenerateChangePhoneNumberTokenAsync(input.UserId, input.MobileNumber);

its 6 nice characters only, 599527 ,143354

and when user virify it simply

var result = await UserManager.VerifyChangePhoneNumberTokenAsync(input.UserId, input.Token, input.MobileNumber);

hope this help you