void FrmOMS_FormClosed(object sender, FormClosedEventArgs e) { if (sender is frmBOX) { frmBOX = null; } }
private void toolStripMenuItem1_Click(object sender, EventArgs e) { if (frmBOX == null) { frmBOX = new frmBOX(); frmBOX.FormClosed += new FormClosedEventHandler(FrmOMS_FormClosed); } if (frmBOX == null) { frmBOX = new frmBOX(); } frmBOX.Show(this.dockPanel2); }