private void User_FormClosed(object sender, FormClosedEventArgs e) { _user = null; }
private void createUserToolStripMenuItem_Click(object sender, EventArgs e) { if (_user == null) { _user = new FrmCreateUser {MdiParent = this}; _user.FormClosed += User_FormClosed; _user.Show(); } else { _user.Activate(); _user.WindowState = FormWindowState.Normal; } }