protected void Page_Load(object sender, EventArgs e)
        {
            int id = Convert.ToInt32(Request.QueryString["ID"].ToString());

            DataSet1TableAdapters.tblKullanicilarTableAdapter dt = new
                                                                   DataSet1TableAdapters.tblKullanicilarTableAdapter();
            dt.OgrenciSil(id);
            Response.Redirect("Admin.aspx");
        }