private void BtnAddEdge_Click(object sender, EventArgs e)
{
string p1 = textPoint1.Text;
string p2 = textPoint2.Text;
string weight = textWeight.Text;
textPoint1.Clear();
textPoint2.Clear();
textWeight.Clear();
controller.AddButtonClick(p1.ToUpper(), p2.ToUpper(), weight, tableEdges);
}