public IActionResult excel()
{
var sFileName = @"demo.xlsx";
var URL = string.Format("{0}://{1}/{2}", Request.Scheme, Request.Host, sFileName);
var fi = bs.fi(true, sFileName);
if (bs.fd(fi))
{
fi = bs.fi(true, sFileName);
}
var package = new ExcelPackage(fi);
var worksheet = package.Workbook.Worksheets.Add("Employee");
worksheet.Cells[1, 1].Value = "ID";
worksheet.Cells[1, 2].Value = "Name";
worksheet.Cells[1, 3].Value = "Gender";
worksheet.Cells[1, 4].Value = "Salary (in $)";
worksheet.Cells["A2"].Value = 1000;
worksheet.Cells["B2"].Value = "Jon";
worksheet.Cells["C2"].Value = "M";
worksheet.Cells["D2"].Value = 5000;
worksheet.Cells["A3"].Value = 1001;
worksheet.Cells["B3"].Value = "Graham";
worksheet.Cells["C3"].Value = "M";
worksheet.Cells["D3"].Value = 10000;
worksheet.Cells["A4"].Value = 1002;
worksheet.Cells["B4"].Value = "Jenny";
worksheet.Cells["C4"].Value = "F";
worksheet.Cells["D4"].Value = 5000;
package.Save();
return(bs.downXlsx(fi));
}