c# - download problem asp.net

Hi this is the current version......please help.

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

public partial class Default2 : System.Web.UI.Page
{
private void BindGrid()
{
DirectoryInfo dir = new DirectoryInfo("D:/Pilabs Projects/GlobeDse/globedse website/globedse.com/Uploads");
FileInfo[] files = dir.GetFiles();
GridView1.DataSource = files;
GridView1.DataBind();

}
protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
         BindGrid();
    }
}
private void Downloadfile(String fileName, String FullFilePath)
{
    Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
    Response.TransmitFile(FullFilePath);
    Response.End();
}
protected void GridView1_RowCommand(object sender, System.Web.UI.WebControls.GridViewCommandEventArgs e)
{
    if (e.CommandName == "Download")
    {
        String[] fileInfo = e.CommandArgument.ToString().Split(';');
        String FileName = fileInfo[1].ToString();
        String FullPath = fileInfo[0].ToString();
        Downloadfile(FileName, FullPath);
    }
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex
    BindGrid();
}

}