asp.net using library ClosedXML to export excel

Reference:  http://closedxml.codeplex.com/

add namespace:

using ClosedXML.Excel;
using System.IO;

Method:

public void ExportDataToExcel(DataTable dt, string fileName)
		{
			using (XLWorkbook wb = new XLWorkbook())
			{

				var ws = wb.Worksheets.Add(dt, "ws");  // worksheets name must be added.
				wb.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
				wb.Style.Font.Bold = true;

				//set header style
				ws.Rows(1, 1).Style.Fill.BackgroundColor = XLColor.White;
				ws.Rows(1, 1).Style.Font.Bold = true;
				ws.Rows(1, 1).Style.Font.FontColor = XLColor.Onyx;
				ws.Columns().Width = 20;

				//remove AutoFilter
				ws.Tables.FirstOrDefault().ShowAutoFilter = false;

				Response.Clear();
				Response.Buffer = true;
				Response.Charset = "utf-8";
				Response.ContentType = "application/vnd.ms-excel";
				Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");

				using (MemoryStream MyMemoryStream = new MemoryStream())
				{
					wb.SaveAs(MyMemoryStream);
					MyMemoryStream.WriteTo(Response.OutputStream);
					Response.Flush();
					Response.End();
				}
			}
		}