>FYI.. why should my commercial application need to read / write windows registry .. because for example: for opening the sql server database .. it needs the server name .. and I planned to save the server name information into some location in windows registry .. so that's why I need to read / write the windows registry .. do you have any idea? TIA
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>Winan

Why not use the web.config or the app.config for a windows app? If it is in ASP.NET, add a ConnectionString inside of the web.config. That way it is very easy to change if they need to change password or etc.

Morgan