高手请指点：用Response.Write导出word中遇到的问题

近日做项目遇到一些问题搞不定，先贴代码：
StringBuilder strBody = new StringBuilder();            strBody.Append("<html " +
                    "xmlns:o='urn:schemas-microsoft-com:office:office' " +
                    "xmlns:w='urn:schemas-microsoft-com:office:word'" +
                    "xmlns='http://www.w3.org/TR/REC-html40'>" +
                    "<head><title>Time</title>");
            //'The setting specifies document's view after it is downloaded as Print
            //'instead of the default Web Layout
            strBody.Append("<!--[if gte mso 9]>" +
                                     "<xml>" +
                                     "<w:WordDocument>" +
                                     "<w:View>"+this.DropDownList1.SelectedValue +"</w:View>" +
                                     "<w:Zoom>100</w:Zoom>" +
                                     "<w:DoNotOptimizeForBrowser/>" +
                                     "</w:WordDocument>" +
                                     "</xml>" +
                                     "<![endif]-->");            strBody.Append("<style>" +
                                    "<!-- /* Style Definitions */" +
                                    "@page Section1" +
                                    "   {size:8.5in 11.0in; " +
                                    "   margin:1.0in 1.25in 1.0in 1.25in ; " +
                                    "   mso-header-margin:.5in; mso-page-orientation:portrait;" +
                                    "   mso-footer-margin:.5in; mso-paper-source:0;}" +
                                    " div.Section1" +
                                    "   {page:Section1;}" +
                                    "-->" +                                   
                                    "@page Section2" +
                                    "   {size:12.5in 11.0in; " +
                                    "   margin:1.0in 1.25in 1.0in 1.25in ; " +
                                    "   mso-header-margin:.5in; mso-page-orientation:landscape;" +
                                    "   mso-footer-margin:.5in; mso-paper-source:0;}" +
                                    " div.Section2" +
                                    "   {page:Section2;}" +
                                    "-->" +      
                                   "</style></head>");            strBody.Append("<body lang=EN-US style='tab-interval:.5in'>" +
                                       "<div class=Section1>" +
                                       "something before cost item   <br clear=all style='page-break-before:always'>" +
                                      "<div class=Section"+this.DropDownList2.SelectedValue +">" +
                                      "before"+
                                      this.FreeTextBox1.Text + " <br clear=all style='page-break-before:always'>"+                                     "</div> other content to export</div></body></html>");
            //'Force this content to be downloaded 
            //'as a Word document with the name of your choice
            Response.AppendHeader("Content-Type", "application/msword");
            Response.AppendHeader("Content-disposition", "attachment; filename=myword.doc");
            Response.Write(strBody);
            Response.End();
 我想让蓝色部分的内容用横版（landscape）来排列，而其他部分，比如红色部分用竖版（portrait）。因为蓝色部分用竖版是显示不全的，但现在的问题是：用上面的代码貌似全部都是横版排列了，并不是我想要的结果，大家对此有什么好的意见啊，敬请指点。