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parameters and combobox

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hi all,

I have problem. I try connect combobox who is  data bound items where data table source is this:

code:

SELECT        Vozac.ID_vozaca, Vozac.Ime, Vozac.Prezime, Vozac.Adresa, Vozac.Broj_mobitela, Vozac.Broj_ziro_racuna, Vozac.datum_voznje, Vozacka_dozvola.Grad_Izdavanja, 
                         Vozilo.Id_vozila, Vozilo.Marka, Vozilo.Broj_registarske_oznake, @vozac_ID AS Expr1
FROM            Vozac INNER JOIN
                         Vozilo ON Vozac.ID_vozaca = Vozilo.ID_vozaca INNER JOIN
                         Vozacka_dozvola ON Vozilo.ID_vozacke_dozvole = Vozacka_dozvola.ID_vozacke_dozvole
WHERE        (Vozac.ID_vozaca = @vozac_ID)

and, in properties of combobox i have display member and value member: ID_vozaca

and I try make when I select "vozac" from combobox then we can see him in datagridview

code from visual studio :

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
           int vozac_ID = Convert.ToInt32(comboBox1.Text);

            this.vozacTableAdapter.FillIme(this.testDataSet.Vozac, vozac_ID);

             
        }

but when I click on combobox nothing happens.

pls, help


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