private void DumpExcel(DataTable tbl)
        {
            using (ExcelPackage pck = new ExcelPackage())
            {
                //Create the worksheet
                ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Demo");

                //Load the datatable into the sheet, starting from cell A1. Print the column names on row 1
                ws.Cells["A1"].LoadFromDataTable(tbl, true);

                //Format the header for column 1-3
                using (ExcelRange rng = ws.Cells["A1:C1"])
                {
                    rng.Style.Font.Bold = true;
                    rng.Style.Fill.PatternType = ExcelFillStyle.Solid;                      //Set Pattern for the background to Solid
                    rng.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(79, 129, 189));  //Set color to dark blue
                    rng.Style.Font.Color.SetColor(Color.White);
                }

                //Example how to Format Column 1 as numeric
                using (ExcelRange col = ws.Cells[2, 1, 2 + tbl.Rows.Count, 1])
                {
                    col.Style.Numberformat.Format = "#,##0.00";
                    col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Right;
                }

                //Write it back to the client
                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.AddHeader("content-disposition", "attachment;  filename=ExcelDemo.xlsx");
                Response.BinaryWrite(pck.GetAsByteArray());
            }
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.IO.Packaging namespace

using System.IO.Packaging;

using System.IO.Packaging;
using OfficeOpenXml;
using OfficeOpenXml.Style;
using System.Data;
using System.Drawing;