Well, im a beginner and im having some problems with the code. On the display it shows System.Data.Objects.ObjectQuery 1[System.String](on the left).
Im trying to merge two diferent tabels by taking Naziv from a different table and adding it to the grid.Another table for the combo(three tables, on the right) And here is the complete code from the class:

 KozmetikaEntitiess tretmanProdukti = new KozmetikaEntitiess();

        public frmTretmaniProdukti()
        public frmTretmaniProdukti(frmMain parent)
            MdiParent = parent;
        private void frmTretmaniProdukti_Load(object sender, EventArgs e)
            cmbTretman.DisplayMember = "Naziv";
            cmbTretman.ValueMember = "TretmanID";
            cmbTretman.DataSource =
                from tretman in tretmanProdukti.Tretmani 
                orderby tretman.TretmanID 
                select tretman ;
        private void cmbTretman_SelectedIndexChanged(object sender, EventArgs e)
            int TID = int.Parse(cmbTretman.SelectedValue.ToString() );

            tretman_ProduktiBindingSource.DataSource =
                from tretmanProdukt in tretmanProdukti.Tretman_Produkti
                where tretmanProdukt.TretmanID == TID
                orderby tretmanProdukt.ProduktID
                select tretmanProdukt;

            grdProdukti.DataSource = tretman_ProduktiBindingSource;                      
        private void tretman_ProduktiBindingNavigatorSaveItem_Click(object sender, EventArgs e)
            MessageBox.Show("Снимено", "", MessageBoxButtons.OK);
        private void NapolniCombo()
            DataGridViewComboBoxColumn colProduktID = new DataGridViewComboBoxColumn();
            colProduktID = grdProdukti.Columns["ProduktID"] as DataGridViewComboBoxColumn;

            colProduktID.ValueMember = "ProduktID";
            colProduktID.DisplayMember = "Naziv";
            colProduktID.DataSource =
                from produkt in tretmanProdukti.Produkti
                orderby produkt.Naziv
                select produkt;
        private void grdProdukti_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
            grdProdukti.CurrentRow.Cells["TretmanID"].Value =  int.Parse(cmbTretman.SelectedValue.ToString());

        private void grdProdukti_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
            if (e.ColumnIndex == 1)
                int PID = int.Parse( e.FormattedValue.ToString()) ;
                grdProdukti.CurrentRow.Cells["Produkt"].Value =
                from tretmanProdukt in tretmanProdukti.Produkti
                where tretmanProdukt.ProduktID == PID
                select tretmanProdukt.Naziv;          

Guys do you need more information? please I need your help..

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