private void userToolStripMenuItem_Click(object sender, EventArgs e) { if (userInfoForm != null) { userInfoForm.Show(); } else { userInfoForm = new UserInfoForm(); userInfoForm.MdiParent = clsFormProvider.mainF; userInfoForm.Show(); userInfoForm.FormClosing += userInfoForm_FormClosing; } }
public void userInfoForm_FormClosing(object sender, FormClosingEventArgs e) { userInfoForm = null; }