How do I solve this line

public List<inventory> getInventory()
        {
            List<inventory> inventory = new List<inventory>();

            int fID, iID;
            
            string queryStr = "INSERT INTO Inventory SELECT FoodID= @fID, ItemID=@itID From Food,Item";

            SqlConnection conn = new SqlConnection(_connStr);
            SqlCommand cmd = new SqlCommand(queryStr, conn);
            cmd.Parameters.AddWithValue("@fID", _fID);
            cmd.Parameters.AddWithValue("@itID", _ITD);
            
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();

            while (dr.Read())
            {
                string foodtemp = dr["FoodID"].ToString();
                fID = int.Parse(foodtemp);
                string itemtemp = dr["ItemID"].ToString();
                iID = int.Parse(itemtemp);

                inventory.Add(new Inventory(foodID,itemID));
            }


            conn.Close();
            dr.Close();
            dr.Dispose();

            return inventory;

        }