protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["uname"] == null)
        {
            Response.Redirect("Default.aspx");
        }
        dboperation h  = new dboperation();
        DataSet     ds = h.dbselect();

        showdata.DataSource = ds;
        showdata.DataMember = "student";
        showdata.DataBind();
    }