public void SaveGraphAs(object sender, EventArgs e) { using (var fd = new SaveFileDialog()) { fd.DefaultExt = "*.grf"; fd.Filter = "Graph files (*.grf)|*.grf|All files (*.*)|*.*"; if (fd.ShowDialog() == DialogResult.OK) { graph.SaveGraph(fd.FileName); savedFileName = fd.FileName; Text = savedFileName; } } }