download.cs

public ActionResult Download()
        {
            string Files = "wwwroot/UploadExcel/CoreProgramm_ExcelImport.xlsx";
            byte[] fileBytes = System.IO.File.ReadAllBytes(Files);
            System.IO.File.WriteAllBytes(Files, fileBytes);
            MemoryStream ms = new MemoryStream(fileBytes);
            return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, "employee.xlsx");
        }