How to Send document from website to client C#

///default.aspx

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">

</asp:Content>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

    <h2>
        Testing opening word document from webpage.
    </h2>
    <asp:Button runat="server" ID="btnStart" Text="Click here" onclick="btnStart_Click"/>
   </p>
</asp:Content>

//default.aspx.cs

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

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    protected void btnStart_Click(object sender, EventArgs e)
    {
        Response.Clear();
        Response.AddHeader("content-disposition", "attachment;filename=Test.docx");
        Response.ContentType = "application/ms-word";
             //If you have sharepoint path then change here..
        Response.TransmitFile(Server.MapPath("test.docx"));
        Response.Flush();
        Response.End();
    }

}