Why designer page does not load in visual studio?

Question

When I click on the deisgner code. Visual studio does not show the graphical designer page. It errors and shows call stack.

Error message: base class can not be loaded. make sure it is referenced and built.

It is referenced within a program.exe file type with many other classes

Answer 1

Hi @Jerome Thiel, 

Welcome to Microsoft Q&A! 

Which version of Visual Studio are you using? What is the target framework and your project type? 

You can try the following workarounds:

1. Update your VS to the latest version.
2. Repair your VS though Visual Studio Installer > More > Repair.
3. Switch to higher target framework for your project.
4. Please check if the project's references load correctly.
5. Close all running VS instances and delete the hidden .vs, bin and obj folders in the project folder. Then, clean and rebuild the solution.  
6. Create a new project and check if it occurs in new project

 

If the designer still failed to load, please share us more details or screenshots to investigate it further.  

Sincerely,

Anna

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".  Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.