Solution to App_Web_****.dll in ASP.NET 2.0 Website - Web Deployment Projects
In case of ASP .NET 2.0 Web Site project, the App_web_******.dll filenames keep changing between successive build! So there’s a redundancy while deploying the application on a remote machine, as the old App_Web_****.dll's won't be overridden and we need to include instructions to remove them manually. The Web deployment Projects add-in for VS 2005 does just that, it gives the developer complete control over the assemblies that are emitted by the Web Site –
https://msdn2.microsoft.com/en-us/asp.net/aa336619.aspx
VS 2005 team’s forum
https://forums.asp.net/138/ShowForum.aspx
Thanks to Scott
https://weblogs.asp.net/scottgu/archive/2005/11/10/430283.aspx