Issues in Undoing textbox values

H! Friends..

I have created a winforms dataentry application for windows. But later we
moved to ubuntu. I installed the same application using Mono in ubuntu. But
the application is getting crashed on repeatedly undoing(pressing ctrl+z )
the values in text boxes at times. Am getting the error as follows.

System.ArgumentOutOfRangeException: Argument is out of range.
  at System.Text.StringBuilder.ToString (Int32 startIndex, Int32 length)
[0x00000] 
  at System.Windows.Forms.Document.Split (System.Windows.Forms.Line line,
System.Windows.Forms.LineTag tag, Int32 pos) [0x00000] 
  at System.Windows.Forms.Document.Split (System.Windows.Forms.Line line,
Int32 pos) [0x00000] 
  at System.Windows.Forms.UndoManager.Insert (System.Windows.Forms.Line
line, Int32 pos, System.Windows.Forms.Line insert, Boolean select) [0x00000] 
  at System.Windows.Forms.UndoManager.Undo () [0x00000] 
  at System.Windows.Forms.TextBoxBase.Undo () [0x00000] 
  at System.Windows.Forms.TextBoxBase.ProcessKey (Keys keyData) [0x00000] 
  at System.Windows.Forms.TextBoxBase.WndProc (System.Windows.Forms.Message&
m) [0x00000] 
  at System.Windows.Forms.TextBox.WndProc (System.Windows.Forms.Message& m)
[0x00000] 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage
(System.Windows.Forms.Message& m) [0x00000] 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc
(System.Windows.Forms.Message& m) [0x00000] 
  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr
wParam, IntPtr lParam) [0x00000]


My environment details:

OS:ubuntu 9.04
mono version: Mono 2.4+dfsg-4~dhx1~jaunty1

Thanks,

Jijesh VR

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