Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
This article provides a high-level overview about what's new with Windows Forms (WinForms) in .NET 10 Preview. For detailed information, see the release announcements.
.NET 10 Preview 5 was released in June 2025.
Each release announcement provides detailed information about Windows Forms changes for .NET 10:
Windows Forms is shipping new code for the clipboard API. The clipboard is redesigned in a way that its code can be shared with Windows Presentation Foundation (WPF). Both desktop technologies now share the same code and unify how they interact with the clipboard.
.NET 9 obsoleted BinaryFormatter, which is used in some clipboard operations. These clipboard operations required you to opt in to compatibility package, or work around the operation. To ease the pain of moving away from BinaryFormatter, .NET 10 is obsoleting certain clipboard methods to indicate that they shouldn't be used. More methods are being added to help JSON serialization with clipboard data, circumventing the need for BinaryFormatter.
Several UITypeEditor types have been ported from .NET Framework, including ToolStripCollectionEditor and several editors related to the DataGridView control. These editors are now discoverable by the PropertyGrid and the Windows Forms Designer Actions panel.
SnapLines were fixed for custom designers.
Here are some of the bugs fixed in Windows Forms for .NET 10:
- If the DataGridView was in edit mode while the hosting dialog was closed, it would throw
InvalidOperationException. The bug causing this has been fixed. - Compiler Error WFO1000 has been improved to reduce false positives related to interfaces that derive from
IComponent. - Fixed a regression with
PrinterSettings.DefaultPageSettings.Colorreturning an incorrect value. - Resolving a memory leak in the MSHTML component.
Improved NVDA screen reader support.
Removed deprecated .NET runtime and unnecessary package references. Code style has been cleaned up to address warnings and improve code quality.
Existing analyzers have been fine-tuned to reduce false positives.
New analyzers have been added:
Collaborate with us on GitHub
The source for this content can be found on GitHub, where you can also create and review issues and pull requests. For more information, see our contributor guide.
.NET Desktop feedback feedback
.NET Desktop feedback is an open source project. Select a link to provide feedback: