void limpaTabelas()
        {
            DBCadPedido       sqlCadPedido       = new DBCadPedido("delivery_db");
            DBCadPedidoItem   sqlCadPedidoItem   = new DBCadPedidoItem("delivery_db");
            DBCadCarrinho     sqlCadCarrinho     = new DBCadCarrinho("delivery_db");
            DBCadCarrinhoItem sqlCadCarrinhoItem = new DBCadCarrinhoItem("delivery_db");

            sqlCadPedido.DeleteRecord();
            sqlCadPedidoItem.DeleteRecord("delete from PEDIDO_ITEM");
            sqlCadCarrinho.DeleteRecord();
            sqlCadCarrinhoItem.DeleteRecord("delete from CARRINHO_ITEM");
        }
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            SetContentView(Resource.Layout.frmCarrinho);

            if (MainActivity.iCodEmpresa > 0)
            {
                sqldb_carrinho      = new DBCadCarrinho("delivery_db");
                sqldb_carrinho_item = new DBCadCarrinhoItem("delivery_db");
                sqldb_pedido        = new DBCadPedido("delivery_db");
                sqldb_pedido_item   = new DBCadPedidoItem("delivery_db");

                lwCarrinho = FindViewById <ListView> (Resource.Id.lwCarrinho);
                ImageButton btAnt          = FindViewById <ImageButton> (Resource.Id.btAnt);
                ImageButton btCarrinho     = FindViewById <ImageButton> (Resource.Id.imgBtCarrinho);
                ImageButton imgBtMenu      = FindViewById <ImageButton> (Resource.Id.imgBtMenu);
                ImageButton btInseriPedido = FindViewById <ImageButton> (Resource.Id.btInseriPedido);
                ImageButton btSubTotal     = FindViewById <ImageButton> (Resource.Id.btSubTotal);
                txtSubTotal = FindViewById <TextView> (Resource.Id.txtSTotal);

                carrinho = carregaCarrinho();

                lwCarrinho.Adapter    = new adapter_carrinho(this, carrinho);
                lwCarrinho.ItemClick += OnListItemClick;

                btAnt.Click          += new EventHandler(btAnt_Click);
                imgBtMenu.Click      += new EventHandler(btMenu_Click);
                btInseriPedido.Click += new EventHandler(btInseriPedido_Click);
                btSubTotal.Click     += new EventHandler(btSubTotal_Click);
            }
            else
            {
                Finish();
                StartActivity(typeof(MainActivity));
            }
        }