Support - FTP FAQ
How can I update a DLL file in my .NET application?
We recommend whenever you upload a DLL or executable to your .NET site that you first upload an app_offline.htm file into the root of your site. The app_offline.htm file has to be a non-zero byte file and will typically include a message like "Site is down for mainentance."
This will take your application offline and allow you to upload without running into the problem of file locks. Once you've completed the upload of your files, simply remove the app_offline.htm file from the server and your application will start automatically.
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