ws.Cells["A1"].Value = "Sample 1";
  ws.Cells["A1"].Style.Font.Bold = true;
  var shape = ws.Drawings.AddShape("Shape1", eShapeStyle.Rect);
  shape.SetPosition(50, 200);
  shape.SetSize(200, 100);
  shape.Text = "Sample 1 text text text";

  if (data.PDFFileName == null) data.PDFFileName = "Spreadsheet.xlsx";
  data.PDFFileName = Path.GetFileNameWithoutExtension(data.PDFFileName) + ".xlsx";

  FileContentResult result = new FileContentResult(pck.GetAsByteArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
  result.FileDownloadName = data.PDFFileName;
  return result;

@Ajax.ActionLink("Created Spreadsheet", "ExportToExcel", "GraphReport", null, new AjaxOptions { HttpMethod = "POST" }, new { @class="btn btn-warning" })