How to enable auto-increment with Sql compact & C#

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I'm using C# 2010 Express.

I have created a SQL Server CE database file (.sdf) then created Information table and ID, Name, City columns with Database Explorer. I want to save names and city user will write to the form. The auto-increment option is disabled in Database explorer and Properties windows. When I'm saving something to that database i must change the ID manually, how can I make ID column auto-increment enabled?

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Mola.Studio On BEST ANSWER

There is a simple way for SQL CE:

ALTER TABLE TableName ALTER COLUMN ColumnName IDENTITY (/*seed*/1, /*increment*/1)