How do I save webform data to csv file on network without user prompts

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CSV

export

I'm trying to create a simple webform, which the user can select values via dropdowns and textboxes. Upon button click event, all data needs to save as csv to a network shared folder, with a random unique filename. I can create the csv file just fine, but am looking for a little direction on how to save to network share without any prompts to the user. Code-behind is below:

What I have tried:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;

namespace AegisSOR
{
public partial class SOR : System.Web.UI.Page
{


protected void Page_Load(object sender, EventArgs e)
{

}

protected void Button1_Click(object sender, EventArgs e)
{
Response.Clear();
Response.ContentType = "text/csv";
Response.AppendHeader("Content-Disposition",
string.Format("attachment; filename={0}.csv", DateTime.Now));
Response.Write(Label1.Text);
Response.Write(",");
Response.Write(Label2.Text);
Response.Write(",");
Response.Write(DropDownList1.Text);
Context.Response.End();
}
}

}