How Do I Saved In Db My Uploaded Image With Javascript In C# Code Behind

<div>Upload your image </div>
   <div>
       <input type='file' id="FileUploadImage" /></div>
   <figure>
       <img id="imgPreview" alt="your image" src="Images/Maria_Hernandez.jpg" width="100" height="100" />
       <figcaption>
           <asp:Label ID="lblImagePath" runat="server"></asp:Label>
       </figcaption>
   </figure>

   <div>
       <asp:Button ID="btnSave" runat="server" Text="Save Profile" Width="140px" OnClick="btnSave_Click" />
   </div>

    <script type="text/javascript">
        function readURL(input) {
            if (input.files && input.files[0]) {
                var reader = new FileReader();

                reader.onload = function (e) {
                    $('#imgPreview').attr('src', e.target.result);
                }
                reader.readAsDataURL(input.files[0]);
            }
        }
        $("#FileUploadImage").change(function () {
            readURL(this);
        });
   </script>

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

namespace WebApplication1
{
    public partial class UploadImage : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnSave_Click(object sender, EventArgs e)
        {
            // I wouldlike to save the uploaded image here
            //First I have to access the uploaded image path from the JavaScript ???
        }
    }
}