ASP.NET--最も簡単なExcelのエクスポート

#region       Excel
 publicvoid CreateExcel(DataTable _table, string FileName)
 {
 //FileName = Server.UrlEncode(FileName);
 HttpResponse response = Page.Response;
 response.Clear();
 response.Buffer =true;
 response.Charset ="GB2312";
 response.HeaderEncoding = System.Text.Encoding.GetEncoding("GB2312");
 response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
 response.AddHeader("Content-Disposition", "attachment;filename="+ FileName);
 response.AddHeader("Content-Type", "application/octet-stream;charset=GB2312");
 response.ContentType ="application/ms-excel";
 string ls_item ="";

 ls_item ="  \t  \t   \t   \t    \t  \t  \t    
";
 response.Write(ls_item);
 ls_item ="";
 int i =1;
 foreach (DataRow row in _table.Rows)
 {
 ls_item = i.ToString() +"\t"+ row[3] +"\t"+ row[4] +"\t"+ row[7] +"\t"+ row[8] +"\t"+ row[9] +"\t"+ row[10] +"\t"+ i.ToString() +"
";
 response.Write(ls_item);
 i++;
 }
 //         HTTP     
 response.Flush();
 response.Clear();
 response.End();
 }
 #endregion