private void usBusinessWindow_FormClosed(object sender, FormClosedEventArgs e) { this.usBusinessWindow = null; }
private void uSBusinessToolStripMenuItem_Click_1(object sender, EventArgs e) { if (this.usBusinessWindow == null) { this.usBusinessWindow = new UsBusinessWindow(); this.usBusinessWindow.MdiParent = this; this.usBusinessWindow.FormClosed += new FormClosedEventHandler(this.usBusinessWindow_FormClosed); this.usBusinessWindow.Show(); } else { this.usBusinessWindow.Activate(); } }