How do I fix argument 2: cannot convert from entities' to 'system.data.entity.core.objects.objectcontext

private void AddProductsToTabbedPanel()
        {
            int i = 1;

            foreach (TabPage tp in tabControl1.TabPages)
            {
                ObjectQuery<tblproduct> filteredProduct = new ObjectQuery<tblproduct>("SELECT VALUE P FROM tblProduct AS P WHERE P.ProductType=" + i.ToString(),pce);

                FlowLayoutPanel flp = new FlowLayoutPanel
                {
                    Dock = DockStyle.Fill
                };

                foreach (tblProduct tprod in filteredProduct)
                {
                    Button b = new Button
                    {
                        Size = new Size(100, 100),
                        Text = tprod.Description,
                        Tag = tprod
                    };
                    b.Click += new EventHandler(UpdateProductList);

                    tp.Controls.Add(b);
                    flp.Controls.Add(b);
                }

private void FilterList(object sender, EventArgs e)
        {
            ObjectQuery<tblproduct> filteredProducts = new ObjectQuery<tblproduct>("SELECT VALUE product FROM tblProducts AS product WHERE product.ProductType = " + cboFilter.SelectedValue,pce);
            dataGridView1.DataSource = filteredProducts;
        }