private void tsMenuCreateUsers_Click(object sender, EventArgs e) { if (creatUsers == null) { creatUsers = new frmCreateUsers(); creatUsers.MdiParent = this; creatUsers.FormClosed += new FormClosedEventHandler(creatUsers_FormClosed); creatUsers.Show(); } else { creatUsers.Activate(); creatUsers.WindowState = FormWindowState.Normal; } }
void creatUsers_FormClosed(object sender, FormClosedEventArgs e) { creatUsers = null; }