Export To Excel using StringBuilder in ASP.net MVC C#

 public ActionResult Export()     {       StringBuilder sb = new StringBuilder();       //static file name, can be changes as per requirement       string sFileName = "filename.xls";       //Bind data list from edmx       var Data = objEntities.citymaster.Take(10).ToList();       if (Data != null && Data.Any())       {         sb.Append("<table style='1px solid black; font-size:12px;'>");         sb.Append("<tr>");         sb.Append("<td style='width:120px;'><b>City Name</b></td>");         sb.Append("<td style='width:300px;'><b>City Code</b></td>");         sb.Append("</tr>");         foreach (var result in Data)         {           sb.Append("<tr>");           sb.Append("<td>" + result.sCityName + "</td>");           sb.Append("<td>" + result.sCityCode + "</td>");           sb.Append("</tr>");         }       }       HttpContext.Response.AddHeader("content-disposition", "attachment; filename=" + sFileName);       this.Response.ContentType = "application/vnd.ms-excel";       byte[] buffer = System.Text.Encoding.UTF8.GetBytes(sb.ToString());       return File(buffer, "application/vnd.ms-excel");     }