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Publishing Updated tables VB.NET?

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Hello, Working in Visual Studio 2005, I've created and deployed an application using the Click Once feature. The client machine downloads the app from a website, installs it and starts importing data to the local machine (using SQL EXPRESS). I add a column to one of the tables from my app, and then re-publish. The client machine installs the app, but passes new tables the local machine, overwritting any existing data that was saved in the table. How do I get around this? What I want to do is just to be able to update a table by adding a column if need be. Thanks in advance.

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