public async Task <IActionResult> UploadAgentData(List <IFormFile> files) { var filePath = Path.GetTempFileName(); if (files.Count == 1 && files[0].Length > 0 && (files[0].FileName.ToUpper().EndsWith(".XLS") || files[0].FileName.ToUpper().EndsWith(".XLSX"))) { using (var stream = new FileStream(filePath, FileMode.Create)) { await files[0].CopyToAsync(stream); } using (ExcelFile file = new ExcelFile(filePath)) { _context.Agents.RemoveRange(_context.Agents); var agents = file.AsEntityList <Agent>(x => x.Replace(" ", string.Empty).ToUpper()); agents.DistinctBy(x => x.Username).ToList().ForEach(x => _context.Agents.Add(x)); await _context.SaveChangesAsync(); } System.IO.File.Delete(filePath); } return(RedirectToAction("Index")); }