Well there are many solutions to this issue but this was my problem and how I fixed it.
To resolve this problem, follow these steps in Visual Studio .NET:
1. In Solution Explorer, select the project name.
2. From the Project menu, click Properties.
3. Click to expand the Configuration Properties node.
4. Under Debugging, in the Enable ASP.NET Debugging list, click True.
dbf7ebe7-a8b7-4cc0-82ba-01e0dbc8a9eb|1|5.0
Visual Studio, .net debugger, enable debugger.