Asp.net mvc

Hi Guys,

I'm using "Microsoft.Office.Interop.Excel" to export my form to excel spreadsheet and it is working fine and save it in the location I provided, but what if I want to let user to save it whenever he wants, like to popup window dialog and let him choose the path?

Here is my code:

public ActionResult Exporttoexcel()
        {
            Itemmodel itm = new Itemmodel();
            try
            {
                Excel.Application application = new Excel.Application();
                Excel.Workbook workbook = application.Workbooks.Add(System.Reflection.Missing.Value);
                Excel.Worksheet worksheet = workbook.ActiveSheet;

                worksheet.Cells[1, 1] = "Itemlookup";
                worksheet.Cells[1, 2] = "Description";
                worksheet.Cells[1, 3] = "Price";
                worksheet.Cells[1, 4] = "Cost";
                int row = 2;
                foreach(var it in itm.Findall())
                {
                    worksheet.Cells[row, 1] = it.Itemlookup;
                    worksheet.Cells[row, 2] = it.Description;
                    worksheet.Cells[row, 3] = it.Price;
                    worksheet.Cells[row, 4] = it.Cost;
                    row++;
                }
                Formatexcel(worksheet, row);
                workbook.SaveAs("d:\\test\\Item_list.xlsx");
                workbook.Close();
                Marshal.ReleaseComObject(workbook);
                application.Quit();
                Marshal.FinalReleaseComObject(application);

            }
            catch(Exception ex)
            {
               ViewBag.message = ex.Message;
            }
            return RedirectToAction("Index");
        }

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