Excel file not saved in user's PC

I have tried to download an excel file from the server to user's PC. I have the following codes from the internet. I have modified the codes a bit....

But when I run the code, nothing happens. The save dialog box is not popping up. What I really want to happen is that the excel file from the server will be saved in user's PC by popping up a save dialog box.

Please help!!!

public void DownloadFile(string url)
{
    string path = Server.MapPath("~/Images/0ca66926-6977-43d3-9c97-f84a43f6ce5d.xls");
    var file = new FileInfo(path);
    string Outgoingfile = "FileName.xlsx";
    if (file.Exists)
    {
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "attachment; filename=" + Outgoingfile);
        Response.AddHeader("Content-Length", file.Length.ToString());
        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        Response.WriteFile(file.FullName);
        Response.Flush();
        Response.Close();

    }
    else
    {
        Response.Write("This file does not exist.");
    }
} 

---

$.ajax({
    url: '@Url.Action("DownloadFile", "Home")',
    type: 'POST',
    contentType: "application/json",
    data: JSON.stringify({ url: urlLink}),
    success: function(res) {

    },
    error: (function() {
        alert("Error to retrieve selected report");
    })
});