private void registroDeClientesToolStripMenuItem_Click(object sender, EventArgs e) { FrmCliente Formulario = new FrmCliente(); bool Cargado = false; foreach (var item in this.MdiChildren) { if (item.Name == Formulario.Name) { Cargado = true; } } if (!Cargado) { Formulario.MdiParent = this; Formulario.Show(); } }