private void button2_Click(object sender, EventArgs e) { materia_prima materia = new materia_prima(); materia.ShowDialog(); }
private void btnMateria_Click(object sender, EventArgs e) { if (!this.MdiChildren.Contains(materia)) { materia = new materia_prima(); materia.MdiParent = this; materia.Show(); } else { materia.Activate(); } }