this.saveFileDialog1=new SaveFileDialog();
this.saveFileDialog1.ShowDialog();
this.saveFileDialog1.AddExtension=true; string path=saveFileDialog1.FileName;
MessageBox.Show(path); rtfExport1=new RtfExport();
rtfExport1.Export(this.viewer1.Document,path);
Process proc=new Process();
proc.StartInfo.FileName=path;
proc.Start();
proc.StartInfo.FileName=path;