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Throws away undo/redo stacks. If the bool is true, then in addition to discarding the undostack the routine will mark the stack as clean.
Namespace:  Microsoft.VisualStudio.Modeling.Shell
Assembly:  Microsoft.VisualStudio.Modeling.Sdk.Shell.12.0 (in Microsoft.VisualStudio.Modeling.Sdk.Shell.12.0.dll)
Syntax
'Declaration
Public Sub DiscardUndoStacks ( _
    markAsClean As Boolean _
)
public void DiscardUndoStacks(
    bool markAsClean
)
public:
void DiscardUndoStacks(
    bool markAsClean
)
member DiscardUndoStacks : 
        markAsClean:bool -> unit
public function DiscardUndoStacks(
    markAsClean : boolean
)
Parameters
- markAsClean
 Type: System.Boolean
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.