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System.NullReferenceException: Object reference not set to an instance of an object.
at System.Drawing.Printing.PrinterSettings.GetModeField(ModeField field, Int16 defaultValue, IntPtr modeHandle)
at System.Drawing.Printing.PrinterSettings.get_Collate()
at System.Windows.Forms.PrintDialog.GetFlags()
at System.Windows.Forms.PrintDialog.ShowPrintDialog(IntPtr hwndOwner, PRINTDLGEX data)
at System.Windows.Forms.PrintDialog.RunDialog(IntPtr hwndOwner)
at System.Windows.Forms.CommonDialog.ShowDialog(IWin32Window owner)
at gdpicture_?.gdpicture_?(IWin32Window A_0, Boolean A_1, Single A_2, Single A_3, Single A_4, Single A_5, Boolean A_6)
at GdPicture.GdViewer.PrintDialogFit(IWin32Window owner)
at EDM.UI.ViewModels.DocumentViewerViewModel.PrintAttachment()