VB.NET designer crashes ... error ... The Base class 'System.Void' cannot be designed. Cannot access forms.

Question

The base class 'System.Void' cannot be designed.The base class 'System.Void' cannot be designed.The base class 'System.Void' cannot be designed. The base class 'System.Void' cannot be designed.

Answer 1

Hi @Randy Glover ,

You can try the following steps.

1. Open the "Designer.cs" file
2. Cut all the code and save the file
3. Paste all the code and save the file

Other steps involve:

• Close and re-open the affected files.
• Clean and rebuild project/solution
• Delete ".VS" folder
• Delete contents in temp folder
• Restart Visual Studio

Best Regards.

Jiachen Li

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Answer 2

Hi, I had the same issue, here's how I managed to get rid of it:

1. Close all UI (designer) files currently opened in the Visual Studio IDE;
2. Use the "Clean build" option in the "Build" drop-down menu;
3. After that, use the "Build solution" option;
4. Open needed UI files and check if the problem is solved;

Hope this helps.