Prevent a checkbox from being checked (not simply uncheck)

Under certain conditions a checkbox I have will display an error. I'm trying do disable the checkbox unless certain conditions are met.

I've tried the following

    private void checkBox66_CheckedChanged(object sender, EventArgs e)
    {
        if (dataGridView3.RowCount == 0)
        {
            checkBox66.Checked = false;
        }
    }

But I realized this actively checks the box, before realizing any kind of uncheck. I need to make sure the checkbox ignores any clicks on it while the rowcount is 0