gis c#另存新檔一個文檔檔案

private void SaveDocument()
  {
//   m_MapDocument=new MapDocumentClass();
//   if(m_MapDocument.get_IsReadOnly(m_MapDocument.DocumentFilename)==true)
//
//   {
//    MessageBox.Show("this map document is read only!");
//    return;
//   }
//   m_MapDocument.Save(m_MapDocument.UsesRelativePaths,true);
//   MessageBox.Show("change saved successfully!");
   saveFileDialog1.Title="Save Map Document";
   saveFileDialog1.Filter="Map Documents(*.mxd)|*.mxd";
   saveFileDialog1.ShowDialog();
   string sFilePath=saveFileDialog1.FileName;
   IMxdContents pMxdC;
   pMxdC = axMapControl2.Map as IMxdContents ;
   IMapDocument pMapDocument = new MapDocumentClass();
   pMapDocument.Open (axMapControl2.DocumentFilename,"");
   IActiveView pActiveView = axMapControl2.Map as IActiveView ;
   pMapDocument.ReplaceContents (pMxdC);
   pMapDocument.SaveAs (sFilePath,true,true);
            MessageBox.Show("Document saved successfully!");
   }