what's wrong with this code?

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C#

ASP.NET

ihave this code and when i click this cancelDVD button i wanna delete a row from the created table in the session. but it doesn't happen. can anybody tell me what's wrong with this code. my code is this,

public partial class Myreservations : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

        if (Session["email"] != null && Session["table"] != null)
        {

            HyperLink choosemore = new HyperLink();
            ImageButton cancelDVD = new ImageButton();
            ImageButton BookDVDs = new ImageButton();

            choosemore.ImageUrl = "~/Images/more.gif";
            choosemore.NavigateUrl = "Movies.aspx";

            cancelDVD.ImageUrl = "~/Images/cancel.gif";
            cancelDVD.Click += new ImageClickEventHandler(cancelDVD_Click);


            BookDVDs.ImageUrl = "~/Images/bookdvds.gif";
          

            Panel1.Controls.Add(choosemore);
            Panel1.Controls.Add(cancelDVD);
            Panel1.Controls.Add(BookDVDs);

            if (Page.IsPostBack == false)
            {


                String Mname = Request.QueryString["Vn"];
                String Myear = Request.QueryString["Vy"];
                String Mstars = Request.QueryString["Vs"];



                DataTable bookingtable = (DataTable)Session["table"];
                DataRow row = bookingtable.NewRow();
                row["Movie Name"] = Mname;
                row["Movie Year"] = Myear;
                row["Starring"] = Mstars;

                if (bookingtable.Rows.Count == 0)
                {

                    bookingtable.Rows.Add(row);
                    bookingtable.AcceptChanges();
                    Reservations.DataSource = bookingtable;
                    Reservations.DataBind();
                    Session.Add("table", bookingtable);



                }
                else
                {
                    bookingtable = (DataTable)Session["table"];
                    bookingtable.Rows.Add(row);
                    bookingtable.AcceptChanges();
                    Reservations.DataSource = bookingtable;
                    Reservations.DataBind();
                    Session.Add("table", bookingtable);

                }
            }
        }

        else
        {
                loginLabel.Text = "You have not logged in.Please log in to book the DVD!";
        }
    }

    private string BookDVDsinDB()
    {
  
        throw new NotImplementedException();
    }

    protected void cancelDVD_Click(object sender, ImageClickEventArgs e)
    {
        DataTable deleteRows = (DataTable)Session["table"];
 
        if (deleteRows.Rows.Count > 1)
        {
            deleteRows.Rows[deleteRows.Rows.Count - 1].Delete();
            deleteRows.Rows[deleteRows.Rows.Count - 2].Delete();
            deleteRows.AcceptChanges();
            Session.Add("table", deleteRows);
        }
        else 
        {
            
            loginLabel.Text = "You must select atlest one DVD!";
        }
      
    }

}