Alter user defined type in SQL Server

Question

I created few user defined types in my database as below

CREATE TYPE [dbo].[StringID] FROM [nvarchar](20) NOT NULL

and assigned them to vario

Answer 1

New answer to an old question:

Visual Studio Database Projects handle the drop and recreate process when you deploy changes. It will drop stored procs that use UDDTs and then recreate them after dropping and recreating the data type.