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    <p>This isn't impossible to do.</p> <p>It sounds like you're wanting users applications to simply interact with a DB that you host. That shouldn't be hard, as there are ADO.net connectors for just about all the popular DBs out there.</p> <p>I'd suggest simply going with MySQL, ADO.Net connector, and use datasets in your program to read and edit data.</p> <p>All the client applications would just have to connect to your IP address where you're hosting the central DB and they'd instantly have access to all of that data.</p> <p>If you're not very experienced in application development, it may be worth it for you or your company to contract a worker to complete this application.</p> <h2>Update</h2> <p>In regards to the update about your client requirements, it sounds like instead you should try connecting to an SQL file that is stored on the client machine. This is EXTREMELY simple to do, and MSVC# has the ADO connector preinstalled. Then, you would have to write another part of the app to perform "updates" every month. You said you need to deliver new data to the customers once a month. Just make the program (when they start it up) check the date, and if required, connect to an FTP site and just download the file to the client machine.</p> <h2>Update II</h2> <p>Ah, ok. That makes things different yet again. This is easier, though. You can make your application read a Database file directly from a CD, which you can mail to people. You should use some sort of PKI style encryption if it needs to be secure. However, due to the nature of the security requirements, I would STRONGLY suggest you contract to someone with experience with encryption, because if you implement something the wrong way, you can expose the data which would be bad :)</p>
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