private void ToExcel(string html)
{
Response.ContentType = "application/force-download";
Response.AddHeader("content-disposition",
"attachment; filename=" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls");
Response.Write("<html xmlns:x=\"urn:schemas-microsoft-com:office:excel\">");
Response.Write("<head>");
Response.Write("<META http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">");
string fileCss = Server.MapPath("~/UI/themes/DRP.UI.Ext.css");
string cssText = string.Empty;
StreamReader sr = new StreamReader(fileCss);
var line = string.Empty;
while ((line = sr.ReadLine()) != null)
{
cssText += line;
}
sr.Close();
Response.Write("<style>" + cssText + "</style>");
Response.Write("<!--[if gte mso 9]><xml>");
Response.Write("<x:ExcelWorkbook>");
Response.Write("<x:ExcelWorksheets>");
Response.Write("<x:ExcelWorksheet>");
Response.Write("<x:Name>Report Data</x:Name>");
Response.Write("<x:WorksheetOptions>");
Response.Write("<x:Print>");
Response.Write("<x:ValidPrinterInfo/>");
Response.Write("</x:Print>");
Response.Write("</x:WorksheetOptions>");
Response.Write("</x:ExcelWorksheet>");
Response.Write("</x:ExcelWorksheets>");
Response.Write("</x:ExcelWorkbook>");
Response.Write("</xml>");
Response.Write("<![endif]--> ");
Response.Write(html);//HTML
Response.Flush();
Response.End();
}