winform窗体缩小到托盘

1.
 private void frmLogon_MinimumSizeChanged(object sender, EventArgs e)
        {
            this.Visible = false;
        }
2.
 private void frmLogon_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
                this.ShowInTaskbar = false;
            else
                this.ShowInTaskbar = true;
        }
3.
private void notifyIcon1_Click(object sender, EventArgs e)
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Normal;  

        }