private void btnThemDinh_Click(object sender, EventArgs e)
        {
            FrmFordBellmanThemDinh form = new FrmFordBellmanThemDinh();

            form.ShowDialog();
            Loadz();
        }
        private void ThemDinhTaiViTri_Click(object sender, EventArgs e)
        {
            int tdx = panelMain.PointToClient(MousePosition).X;
            int tdy = panelMain.PointToClient(MousePosition).Y;
            FrmFordBellmanThemDinh form = new FrmFordBellmanThemDinh(tdx, tdy);

            form.ShowDialog();
            Loadz();
        }