private void pictureBoxMain_MouseUp(object sender, MouseEventArgs e) { if (radioButtonLink.Checked == true) { Node EndLink = MainGraph.Nodes.Find(x => (x.GetX() - TextPos <e.X && x.GetX() + TextPos> e.X) && (x.GetY() - TextPos <e.Y && x.GetY() + TextPos> e.Y)); if (EndLink != null) { EndLink.AddNewLink(TPositionNode); } else { DrawNodes(); } } TPositionNode = null; }