private void listarClientesToolStripMenuItem_Click(object sender, EventArgs e) { if (listClient == null) { listClient = new frmListarClientes(); listClient.MdiParent = this; listClient.FormClosed += new FormClosedEventHandler(listClient_FormClosed); listClient.Show(); } }
void listClient_FormClosed(object sender, EventArgs e) { listClient = null; }