Code Never Runs Upon Exit

public void ShowForm(System.Windows.Forms.Form frm, string id)
{
    frmMain=frm;
    this.Show();

    object empty = null;

    axW.Navigate("http://localhost:2124/Studiebogservice/_Ankomst/LabelPrint.aspx?id=" + id, ref empty, ref empty, ref empty, ref empty);

    for (; axW.ReadyState != SHDocVw.tagREADYSTATE.READYSTATE_COMPLETE; )
    {
        System.Windows.Forms.Application.DoEvents();
    }

    axW.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref empty, ref empty);

    Environment.Exit(1);
}