Im working developing a system web page and suddenly appears this error:
Could not load file or assembly \'System.Web.WebPages.Deployment, Version=1.0.0.0, C
In my case this was due to corrupted assembly being referenced which happened due to crash restart of my laptop.
To fix this please following these steps
Clean all the files in the following folders of your project or you can simply click on clean project and clean solution
Clean the Appdata temp folder for my Win 7 machine its located here C:\Users\your_username\AppData\Local\Temp\Temporary ASP.NET Files in windows 7
Hope this helps!