组合框的SelectedIndexChanged事件-填充控制值

SelectedIndexChanged 事件发生时,我需要用它的值填充相应的控件。我使用实体框架6作为方法。我使用的是c#windows窗体和.net framework 4.5。我的代码是:

private void comboBoxCustomer_SelectedIndexChanged(object sender, EventArgs e)
{
    using (ReliableTradersEntities entities = new ReliableTradersEntities())
    {
        m_blouse = new BLOUSE_MEASUREMENT();
        m_pardi = new PARDI_MEASUREMENT();
        m_lengha = new LHENGA_MEASUREMENT();

        var res = from c in entities.CUSTOMERs
                        join p in entities.PARDI_MEASUREMENT on c.CUSTOMERID equals p.CUSTOMERID
                        join l in entities.LHENGA_MEASUREMENT on c.CUSTOMERID equals l.CUSTOMERID
                        join b in entities.BLOUSE_MEASUREMENT on c.CUSTOMERID equals b.CUSTOMERID
                        select new 
                        {

                            p.PARDILENGTH,
                            p.PARDILIMIT,
                            p.SHOULDER,
                            p.SHOULDERTOHEAD,
                            p.HEADTOBACK,
                            p.HALFHEADROUND,
                            p.NIQABLENGTH,
                            p.KAS,
                            l.LHENGALENGTH,
                            l.LHENGALIMIT,
                            l.BELTOPTION,
                            l.ISPOCKET,
                            l.ISZIP,
                            l.STYLE,
                            l.STYLESIZE,
                            l.ALINE,
                            b.BLOUSELENGTH,
                            b.CHEST,
                            b.WAIST,
                            b.SLEEVES,
                            b.NECK,
                            b.POINT,
                            b.BLOUSEOPENING
                        };
        textBoxPL.Text = m_pardi.PARDILENGTH;
    }

}