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TextBoxBase.Undo Method

Undoes the most recent undo command. In other words, undoes the most recent undo unit on the undo stack.

Namespace:  System.Windows.Controls.Primitives
Assembly:  PresentationFramework (in PresentationFramework.dll)

'Declaration
Public Function Undo As Boolean

Return Value

Type: System.Boolean
true if the undo operation was successful; otherwise, false. This method returns false if the undo stack is empty.

The following example demonstrates how to use the Undo method.

Private Sub undoAction(ByVal sender As Object, ByVal e As RoutedEventArgs)
    If myTextBox.CanUndo = True Then
        myTextBox.Undo()
    Else : Return 
    End If 
End Sub

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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