Export aspx page to word in ASP.net c#

StringBuilder strHTMLContent = new StringBuilder();
            //appending the style sheet 
            strHTMLContent.Append("<style>.tableHeader{background-color:#CCCCCC;font-weight:bold; }.style1 { width: 100%;border-collapse:collapse;}.firstHeader { background-color: #3366CC; font-weight: bold;color: #FFFFFF;}</style>".ToString());
            
             //strHTMLContent.Append("<style>.firstHeader { background-color: #3366CC; font-weight: bold;color: #FFFFFF;}</style>".ToString());
        
            pageObject.Response.Clear();
            pageObject.Response.AddHeader("content-disposition", "attachment; filename=FileName.doc");
            pageObject.Response.Charset = "";
            pageObject.Response.Cache.SetCacheability(HttpCacheability.NoCache);
            pageObject.Response.ContentType = "application/doc";
            StringWriter stringWrite = new StringWriter();
            HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
            myDiv.RenderControl(htmlWrite);

            pageObject.Response.Write(strHTMLContent.Append(stringWrite).ToString());   // send the stringWrite          
            pageObject.Response.End();