private void 检查更新VToolStripMenuItem_Click(object sender, EventArgs e)
{
if (updateForm != null)
{
updateForm.Activate();
}
else
{
updateForm = new UpdateForm();
updateForm.Show();
updateForm.Activate();
updateForm.FormClosed += updateFormClosed;
}
}
void updateFormClosed(object sender, FormClosedEventArgs e)
{
updateForm.Dispose();
updateForm = null;
Utils.ReleaseMemory(true);
}