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You want to make sure that you're using a version control system though, because diffing is really handy.
Now i need to add a new column to a table used in dbml file.
#1 the best simple way: you can create a new dbml file and drag the related tables and it generates the code.
#2 There's no built-in way to sync the dbml file/datacontext with the database after making changes (), but there are third-party tools that add refresh functionality to the Visual Studio L2S designer : One such tool is my add-in, Huagati DBML/EDMX Tools.
I highly recommend implementing a solution like this - it has saved me oodles of time, and unlike deleting and re-adding your tables to your model you get to keep your associations.
With this solution, you'll get compile-time errors when your schema changes.
Of course, I can't share my company's code so you're on your own for writing this yourself.