If the Windows Forms Designer fails to load due to an error in your code, in a third-party component, or elsewhere, you'll see an error page instead of the designer.
This error page does not necessarily signify a bug in the designer. Errors appear in collapsible, yellow bars with a link to jump to the location of the error on the code page. You can choose to ignore the errors and continue loading the designer by clicking Ignore and Continue. This action may result in unexpected behavior, for example, controls may not appear on the design surface. When the yellow error bar is expanded, each instance of the error is listed.
If a call stack is associated with the error, you can click the Show Call Stack link to see it. Examining the call stack may further help you resolve the error. If a help topic for the error is available, click the MSDN Help link to navigate directly to the help page on docs.
Please enter a unique name. You've specified a name for an inherited form that already exists in the project. To correct this error, give the inherited form a unique name. A third-party designer has tried to access a tab on the Toolbox that does not exist. Contact the component vendor. Error message: "A requested language parser is not installed. Visual Studio attempted to a load a designer that's registered for the file type but could not.
This is most likely because of an error that occurred during setup. Contact the vendor of the language you're using for a fix. A third-party designer requested that Visual Studio create an object, but the object raised an error.
Please close the editor and try this operation again. This error arises if you try to open a file that is already opened in another editor. The editor that already has the file open is shown.
To correct this error, close the editor that has the file open, and try again. Close and reopen the designer for the changes to take effect. Normally, Visual Studio automatically reloads a designer after changes are made. However, other designers, such as third-party component designers, may not support reload behavior. In this case, Visual Studio prompts you to close and reopen the designer manually.
Error message: "Another editor has the file open in an incompatible mode. Visual Studio only supports single-dimension arrays in the code block that's parsed by the designer. Multidimensional arrays are valid outside this area. Verify that the file still exists. This error message arises when you try to open a file that could not be opened.
Verify that the file exists and is a valid assembly. Visual Studio made a call to the Toolbox, which was not available. If you see this error, If you see this error, please log an issue by using Report a Problem. This error most often arises when you've tried to connect an event to a control that's inherited from a base class.
If the control's member variable is private, Visual Studio cannot connect the event to the method. Privately inherited controls cannot have additional events bound to them. Visual Studio has tried to add an event handler to a component that does not have a member variable in the designer. This is an internal error in the Visual Studio serializer. It indicates that the serializer has tried to name an object twice, which is not supported.
If you see this error, please log an issue by using Report a Problem. Inherited controls are under the ownership of their inheriting class. Changes to the inherited control must be made in the class from which the control originates. Thus, you cannot rename or destroy it. The designer tried to reference a class on a particular Toolbox tab, but the class does not exist. Improve this answer. Shawn Shawn. In my case I had just renamed the form and walked away. I deleted the project. Waqar Salim Waqar Salim 21 1 1 bronze badge.
JaredPar JaredPar k gold badges silver badges bronze badges. Missing empty constructor of the form — RcMan. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses.
Be a part of the DaniWeb community. Sign Up — It's Free! Reply to this Topic. This question has already been solved! The person who asked this question has marked it as solved. Solved questions live forever in our knowledge base where they go on to help others facing the same issues for years to come.
Are you sure you have something valuable to add that has not already been mentioned? Consider starting a new topic instead. Otherwise, please be thoughtful, detailed and courteous, and adhere to our posting rules. Edit Preview. H1 H2. Close the solution. SUO files. Then reload the solution in Visual Studio. In the solution file explorer, right click on the targeted form source and select the "View code" not "View Designer". When the source file is opened, then right click over the source text and select View in designer.
This can be beneficial to other community members reading this thread. Thanks a bunch - I think that since the only thing I have done on the project is that one form, I'll just delete that and give it another shot in a clean environment. The more I think about it, I feel certain that since I'm just starting on this laptop and a really different keyboard, I unknowingly touched a key that I should have avoided.
If so, hope you can close this thread by marking the useful reply as answer as this will help others looking for the same or similar issues down the road. Just for few of them I receive the following error:. But everything is working; the only problem is the error message. I've erased the file Peace. But which one? Thanks a lot.
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