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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 3 was released in April 2025.
Release announcements
Clipboard changes
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 will eventually 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.
Custom designer improvements
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.
Accessability
Improved NVDA screen reader support.
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