Document.SaveAs method withoud password?

I want to save as a document without a password. The method SaveAs 4. and 6. parameters Password --> A password string for opening the document. (See Remarks below.) WritePassword --> A password string for saving changes to the document. (See Remarks below.) If I use the object missing = string.Empty and object missing = System.Reflection.Missing.Value lines the document saved corrupted and it can not be opened. What to do to save as the document without password. Please help

object FileName = RIS_CLIENT.Properties.Settings.Default.DownloadPath + "\\" + m_docFileName + ".docm";
                object FileFormat = Microsoft.Office.Interop.Word.WdSaveFormat.wdFormatXMLDocumentMacroEnabled;
                object LockComments = false;
                object AddToRecentFiles = false;
                object ReadOnlyRecommended = false;
                object EmbedTrueTypeFonts = false;
                object SaveNativePictureFormat = true;
                object SaveFormsData = false;
                object SaveAsAOCELetter = false;
          开发者_高级运维      object missing = "pass";
              //object missing = String.Empty;
              //object missing = System.Reflection.Missing.Value;  


                objWinWordControl.document.SaveAs(ref FileName, ref FileFormat, ref LockComments, ref missing,
                    ref AddToRecentFiles, ref missing, ref ReadOnlyRecommended, ref EmbedTrueTypeFonts,
                    ref SaveNativePictureFormat, ref SaveFormsData, ref SaveAsAOCELetter);

According to this link, System.Reflection.Missing.Value is the correct way of specifying missing values, but you say that does not work.

I also found another link which is using System.Type.Missing, so you may wish to try this approach.

Edit: actually, it appears that Type.Missing is actually just Missing.Value in disguise, so if the latter is not working, neither will the former.