c#操作word 在指定书签插入文字或者图片

using Word = Microsoft.Office.Interop.Word;

object Nothing = System.Reflection.Missing.Value;
         object format = Word.WdSaveFormat.wdFormatDocument;
         Word.Application wordApp = new Word.ApplicationClass();
         //打开网页选择内容
         object srcFileName = @"c:\new1.doc"; //里面有图片
          Word.Document wordDoc2 = wordApp.Documents.Open(ref srcFileName, ref format, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing);
            try
{
             object bookmarkName = "jlr";
             //Word.Range rng = wordDoc2.Bookmarks.get_Item(ref bookmarkName).Range;
             //rng.Text = "newText";
             //object range = rng;
             //wordDoc2.Bookmarks.Add("jlr", ref range);
             wordDoc2.Bookmarks.get_Item(ref bookmarkName).Select();
             wordApp.Selection.InlineShapes.AddPicture("c:\\1.jpg", ref Nothing, ref Nothing, ref Nothing);
             wordDoc2.Save();

      

         }
         catch { }
         finally
         {
             //关闭网页wordDoc2
             wordDoc2.Close(ref Nothing, ref Nothing, ref Nothing);
             if (wordDoc2 != null)
             {
                 System.Runtime.InteropServices.Marshal.ReleaseComObject(wordDoc2);
                 wordDoc2 = null;
             }
             //关闭wordApp
             wordApp.Quit(ref Nothing, ref Nothing, ref Nothing);
             if (wordApp != null)
             {
                 System.Runtime.InteropServices.Marshal.ReleaseComObject(wordApp);
                 wordApp = null;
             }
         }
         GC.Collect();