manipulating an XML

<?xml version="1.0" ?>
- <Aparate>
- <Aparat>
<Denumire>AF MARINCA SAECO 1P</Denumire>
<NumarCitire>156</NumarCitire>
<DataCitire>31.10.2007</DataCitire>
<ContorGeneralInitial>817</ContorGeneralInitial>
<ContorGeneralFinal />
- <Pozitii>
- <Pozitie>
<Produs>Cafea espress</Produs>
<ContorInitial>817</ContorInitial>
<ContorFinal />
</Pozitie>
- <Pozitie>
<Produs>Cafea cu lapte</Produs>
<ContorInitial>317</ContorInitial>
<ContorFinal />
</Pozitie>
</Pozitii>
<Denumire>LAVAZZA</Denumire>
<NumarCitire>112</NumarCitire>
<DataCitire>31.10.2007</DataCitire>
<ContorGeneralInitial>144</ContorGeneralInitial>
<ContorGeneralFinal />
- <Pozitii>
- <Pozitie>
<Produs>Cafea espress</Produs>
<ContorInitial>817</ContorInitial>
<ContorFinal />
</Pozitie>
- <Pozitie>
<Produs>Cafea cu lapte</Produs>
<ContorInitial>317</ContorInitial>
<ContorFinal />
</Pozitie>
- <Pozitie>
<Produs>Capucino</Produs>
<ContorInitial>123</ContorInitial>
<ContorFinal />
</Pozitie>
</Pozitii>
</Aparat>
</Aparate>

i put in a combo Denumire.So i have 2 items in the combo
Now,how can i ,when i select from the combo one of the 2 itmes,put in a grid the right data?

the code i use to insert items in combo is this
XmlDocument xd = new XmlDocument();
xd.Load("contor.xml");
XmlNodeList xnd = xd.SelectNodes(@"Aparate/Aparat/Denumire");
foreach (XmlNode xn in xnd)
{
string sDenumire = xn.InnerText;
this.comboBox1.Items.Add(sDenumire);
}