Windows Forms
A set of .NET Framework managed libraries for developing graphical user interfaces.
1,914 questions
how to fix "Designer load encountered and error. Please ensure that the project can be built successfully."
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(80, 21%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESM%3C/text%3E%3C/svg%3E)
Santos, Mark Jairo (Student)
25
Reputation points
Windows Forms
C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
11,152 questions
{count} votes
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Karen Payne MVP 35,461 Reputation points2024-04-13T08:56:30.3966667+00:00 Which .NET Framework? ( .NET Core 8, .NET Framework 4.8)
Are there any custom or third party controls used in this form?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(0, 40%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
mikefinch87 115 Reputation points2024-06-06T15:18:55.7033333+00:00 @Karen Payne MVP I have the same issue.
<TargetFramework>net6.0-windows</TargetFramework>No custom or 3rd part controls.
I was able to resolve by adding a reference to System.Windows and PresentationFramework, which generated an error, and then when I removed did a clean rebuild and it worked.
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mikefinch87 115 Reputation points
2024-06-06T15:23:35.8466667+00:00 Also had to close and reopen Visual studio.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 84%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJW%3C/text%3E%3C/svg%3E)
Jonathan Wood 11 Reputation points2024-11-27T19:46:28.29+00:00 I have this same issue with both .NET 8 and .NET 9. Using both versions, I created a new WinForms project, and this is the screen I get. No error description. Just the message that an error occurred.
I thought MS was going to improve WinForms. They take absolutely forever to load. And now this!
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