private void addToolStripMenuItem_Click(object sender, EventArgs e) { var c = new ColumnEditer(Accounts); c.ShowDialog(); if (c.ResultColumn != null) { var r = c.ResultColumn; r.MdiParent = this; r.Show(); r.Size = new Size(240, this.Size.Height - 160); if (Columns.Count > 0) { r.Text = (int.Parse(Columns[Columns.Count - 1].Text[0].ToString()) + 1) + ": " + r.Text; } else { r.Text = 0 + ": " + r.Text; } Columns.Add(r); } }