Try it this way in your form class:
private bool initialized = false;
public MyForm()
{
InitializeComponents();
this.initialized = true;
}
void checkbox_clickevent(object sender, EventArgs e)
{
if (initialized)
{
CheckBox checkBox = sender as CheckBox;
if (!checkBox.Checked)
{
if (!UserVerified())
{
checkBox.Checked = true;
}
}
}
}
You may need to tweak this a bit, but I think you get the idea.