I'm getting the following error: Could not load file or assembly 'System.Web' or one of its dependencies. The system cannot find the file specified.
To reproduce it, Create a new website in Visual Studio 2012. It creates a new templated website. Add the AjaxControlToolkit via NuGet. Change the scriptmanager to the toolkit scriptmanager on the masterpage. Clean solution, compile solution, run in debug.
I checked and double checked my references to System.Web (version 4.0 is what shows). All perfect. Running Code Analysis - no errors, no warnings, all perfect.
Any ideas? (All I want to do is create a simple website using a few AJAX controls)