dotnet/Documentation/compatibility/wpf-textbox-defaults-to-und...

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## WPF TextBox defaults to undo limit of 100
### Scope
Edge
### Version Introduced
4.5
### Source Analyzer Status
Planned
### Change Description
In .NET Framework 4.5, the default undo limit for a WPF textbox is 100 (as opposed to being unlimited in .NET Framework 4.0)
- [ ] Quirked
- [ ] Build-time break
### Recommended Action
If an undo limit of 100 is too low, the limit can be set explicitly with <xref:System.Windows.Controls.Primitives.TextBoxBase.UndoLimit>
### Affected APIs
* `T:System.Windows.Controls.TextBox`
### Category
Windows Presentation Foundation (WPF)
<!-- breaking change id: 51 -->