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