save/upload files in folder and download files from folder in asp.net

Front end code:

<div>

<asp:FileUpload ID="fileUpload1" runat="server" /><br />

<asp:Button ID="btnUpload" runat="server" Text="Upload" onclick="btnUpload_Click" />

</div>

Back End Code:

protected void btnUpload_Click(object sender, EventArgs e)

{

string filename = Path.GetFileName(fileUpload1.PostedFile.FileName);

fileUpload1.SaveAs(Server.MapPath("Files/"+filename));

con.Open();

}