Download File using Path stored in XML file in ASP.Net

Html Code:-

 <asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false" OnPageIndexChanging="OnPageIndexChanging"
        AllowPaging="true" PageSize="10">
        <Columns>
            <asp:BoundField DataField="Date" HeaderText="Date" />
            <asp:BoundField DataField="Name" HeaderText="Name" />
            <asp:BoundField DataField="Qualification" HeaderText="Qualification" />
            <asp:BoundField DataField="areaofinterest" HeaderText="areaofinterest" />
            <asp:BoundField DataField="yearofexperience" HeaderText="yearofexperience" />
            <asp:BoundField DataField="Mobile" HeaderText="Mobile" />
            <asp:BoundField DataField="EmailID" HeaderText="EmailID" />
            <asp:BoundField DataField="Address" HeaderText="Address" />
            <asp:BoundField DataField="Country" HeaderText="Country" />
            <asp:BoundField DataField="City" HeaderText="City" />
            <asp:BoundField DataField="state" HeaderText="state" />
            <asp:TemplateField HeaderText="Resume">
                <ItemTemplate>
                    <asp:LinkButton ID="lnkResume" runat="server" Text='<%#Eval("Resume") %>' OnClick="Download"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

C# Code:-

 protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                this.BindGrid();
            }
        }

        protected void Download(object sender, EventArgs e)
        {
            string filePath = (sender as LinkButton).Text;
            if (File.Exists(filePath))
            {
                string fileName = Path.GetFileName(filePath);
                Response.Clear();
                Response.Buffer = true;
                Response.AddHeader("content-disposition", "attachment;filename=" + fileName);
                Response.Charset = "";
                Response.ContentType = "application/vnd.ms-word ";
                Response.WriteFile(filePath);
                Response.Flush();
                Response.End();
            }
            else
            {
                Page.ClientScript.RegisterStartupScript(this.GetType(), "script", "<script type='text/javascript'>alert('file is not present');</script>");
            }
        }

        protected void OnPageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            this.gvCustomers.PageIndex = e.NewPageIndex;
            this.BindGrid();
        }

        private void BindGrid()
        {
            using (DataSet ds = new DataSet())
            {
                ds.ReadXml(Server.MapPath("~/Files/Registrations.xml"));
                this.gvCustomers.DataSource = ds;
                this.gvCustomers.DataBind();
            }
        }

Namespaces:-

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.IO;