请问：Excel转换为html时，如何只将选定区域的内容转换过去？

大家好，我现在在做将word和excel转换为html，直接在网页显示的功能。
遇到以下几个问题：
  1、excel转为html时，如何只将选定区域的内容转换为html。现在是将整个workbook转成html，转完后，原excel里的空白单元格也一并转过来了，这样就造成页面上表格在最左边，右边有很大一块空白区域。
  2、将excel和word转为html时，转完后的内容都居左，怎样才能居中哪？
谢谢 --------------------编程问答-------------------- 不懂

友情帮顶吧 --------------------编程问答-------------------- 我是用的com组件，代码如下：
word->html:

        Microsoft.Office.Interop.Word.ApplicationClass myWordApp = new Microsoft.Office.Interop.Word.ApplicationClass();

        Type myWordType = myWordApp.GetType();
        Microsoft.Office.Interop.Word.Documents myDocs = myWordApp.Documents;

        try
        {
            // 打开文件
            Type myDocsType = myDocs.GetType();
            object objFileName = strFile;
            Microsoft.Office.Interop.Word.Document myDoc = (Microsoft.Office.Interop.Word.Document)myDocsType.InvokeMember("Open",
                System.Reflection.BindingFlags.InvokeMethod, null, myDocs, new Object[] { objFileName, true, true });

            // 转换格式，另存为
            Type myDocType = myDoc.GetType();
            object objSaveFileName = "c:\\" + strFileName + ".html";
            myDocType.InvokeMember("SaveAs", System.Reflection.BindingFlags.InvokeMethod, null, myDoc,
                                new object[] { objSaveFileName, Microsoft.Office.Interop.Word.WdSaveFormat.wdFormatFilteredHTML }); // 退出 Word
            myWordType.InvokeMember("Quit", System.Reflection.BindingFlags.InvokeMethod, null, myWordApp, null);
            //Response.ContentType = "Application/doc";
            //string FilePath = MapPath("会议纪要－40.html");
            //Response.WriteFile(FilePath);
            //Response.End();


        }
        catch
        {
        }

excel->html:

        object objMissing = System.Reflection.Missing.Value;
        Microsoft.Office.Interop.Excel.ApplicationClass myExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
        Microsoft.Office.Interop.Excel.Workbook myExcelWb = null;

        myExcelWb = myExcelApp.Application.Workbooks.Open(strFile, objMissing, objMissing, objMissing,objMissing,objMissing,
                        objMissing,objMissing,objMissing,objMissing,objMissing,objMissing,objMissing,objMissing,objMissing);

        object objSaveFileFormat = Microsoft.Office.Interop.Excel.XlFileFormat.xlHtml;
        myExcelWb.SaveAs("c:\\" + strFileName + ".html", objSaveFileFormat, objMissing, objMissing, objMissing, objMissing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,
                objMissing, objMissing,objMissing,objMissing,objMissing);

        object objSave = false;
        myExcelWb.Close(objSave, objMissing, objMissing); --------------------编程问答-------------------- 帮你顶一下 --------------------编程问答-------------------- 有没有人知道阿？ --------------------编程问答-------------------- 帖子沉掉了

补充：.NET技术 ,  ASP.NET