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

        Response.Write(x);
        EntityOgrenci ent = new EntityOgrenci();

        ent.Id = x;
        BLLOgrenci.OgrenciSilBLL(ent.Id);
        Response.Redirect("OgrenciListesi.aspx");
    }