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");  
   }