protected void btnSave_Click(object sender, EventArgs e)
    {
        NarackaLINQDataContext db = new NarackaLINQDataContext();

        Naracki naracka = new Naracki();

        naracka.objekt = Convert.ToInt32(txtObjekt.Text);
        naracka.datum = txtDatum.Text;
        naracka.sifra = txtSifra.Text;
        naracka.kolicina = Convert.ToInt32(txtKolicina.Text);

        db.Narackis.InsertOnSubmit(naracka);

        Response.Redirect("Naracka.aspx");
    }
}

there are no errors but no data is inserted into Database. Please help!

...
 naracka.kolicina = Convert.ToInt32(txtKolicina.Text);

 db.Narackis.InsertOnSubmit(naracka);
 db.SubmitChanges();