I have a normal database and not using any membership provider and I would like to auto-generate a new user ID which is created in database with a new user registration.
As seen below this is what I need.

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That is a GUID (in .net) or uniqueidentifier (in SQL).
If you are using Microsoft SQL Server you can execute the following T-SQL:
…and then execute your INSERT statement.
If you prefer to generate the ID in VB.NET you can use the following code: