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UndoCount Property
Example 

Returns the number of undone actions.
Syntax
'Declaration
 
Public ReadOnly Property UndoCount As Integer
public int UndoCount {get;}

Property Value

Integer.
Example
If(this.ardMain.UndoManager.UndoCount == 0 )
{
    this.tSTDUndo.Enabled = False;
    this.mnuEditUndo.Enabled = False;
}
Else
{
    this.tSTDUndo.Enabled = True;
    this.mnuEditUndo.Enabled = True;
}
If Me.ardMain.UndoManager.UndoCount = 0 Then
    Me.tSTDUndo.Enabled = False
    Me.mnuEditUndo.Enabled = False
Else
    Me.tSTDUndo.Enabled = True
    Me.mnuEditUndo.Enabled = True
End If
Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also

Reference

UndoManager Class
UndoManager Members

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