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copied!<p>If it's a small, fairly simple chunk of data, you can create an XML serializable class and very easily write it to disk on shutdown and read it back on startup. For a simple enough class, you can just add the <a href="http://msdn.microsoft.com/en-us/library/system.serializableattribute.aspx" rel="nofollow noreferrer">[Serializable]</a> attribute, and the <a href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer.aspx" rel="nofollow noreferrer">XmlSerializer</a> will automatically know how to serialize/deserialize it.</p> <p>If you have enough data that a SQL database would be a better fit, look into <a href="http://www.microsoft.com/Sqlserver/2008/en/us/compact.aspx" rel="nofollow noreferrer">SQL Server Compact Edition</a> or the <a href="http://sqlite.phxsoftware.com/" rel="nofollow noreferrer">System.Data.SQLite</a> binding for <a href="http://www.sqlite.org/about.html" rel="nofollow noreferrer">SQLite</a>.</p> <p>Both will let you create a database as a single file, without having to install any extra Windows services or configure anything. System.Data.SQLite doesn't even need to be installed - it's contained entirely with the .dll that your project references.</p> <p>In either case, the best location for the file is probably <a href="http://msdn.microsoft.com/en-us/library/system.environment.specialfolder%28VS.80%29.aspx" rel="nofollow noreferrer">SpecialFolder.CommonApplicationData</a> - I think this ends up being C:\ProgramData\ on Vista, but avoids having to hardcode the exact path.</p>

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