PRB: "Could not load type" error message when you browse to .aspx page by using Visual C# .NET


When you browse to an .aspx page, you may receive one of the following error messages:
Could not load type 'Namespace.Global'.
Could not load type 'Namespace.PageName'.


These errors occur if the .aspx page or the Global.asax page contains a reference to a code-behind module and if the application has not been built.


Use one of the following methods to build the application:
  • Use the C# command line compiler (CSC.exe) to run the following command:
    csc /t:library /r:System.web.dll /out:mydll.dll myfile.cs
  • In Microsoft Visual Studio .NET, click Build on the Build menu.
NOTE: Microsoft Visual Basic .NET background compiles the project as soon as it is created. Because Visual C# .NET projects only background parse, you must explicitly build the application.


This behavior is by design.

More Information

Steps to Reproduce the Behavior

  1. Start Visual Studio .NET.
  2. On the File menu, point to New, and then click Project.
  3. Click Visual C# Projects under Project Types, and then click ASP.NET Web Application under Templates.
  4. Right-click WebForm1.aspx, and then click View in Browser.


For more information about building assemblies, visit the following MSDN Web site: