Value of isSubmitting not defined.

[MarcoPalomo]

Hello guys,
Really nice content. On the Blazor trainning, I cannot finish the @layout part because of this. In the Checkout.razor file, I have a property named isSubmitting for a button :

<button class="checkout-button btn btn-warning" @onclick="PlaceOrder" disabled=@isSubmitting>

and this is obviously resulting in an error there too.

@code {
    Order Order => OrderState.Order;
    async Task PlaceOrder()
    {
        isSubmitting = true;
        var response = await HttpClient.PostAsJsonAsync($"{NavigationManager.BaseUri}orders", OrderState.Order);
        var newOrderId = await response.Content.ReadFromJsonAsync<int>();
        OrderState.ResetOrder();
        NavigationManager.NavigateTo("/myorders");
    }

}

Resulting in an error and I cannot do my dotnet watch.

error CS0103: The name 'isSubmitting' does not exist in the current context [/home/computer/Documents/sidePrj/CsharpProjects/BlazingPizza/BlazingPizza.csproj]

Please shed some lights.

[pmarangoni]

The code section should have the variable declaration:

@code {
    Order Order => OrderState.Order;
    bool isSubmitting;

    async Task PlaceOrder()
    {
        isSubmitting = true;
        var response = await HttpClient.PostAsJsonAsync($"{NavigationManager.BaseUri}orders", OrderState.Order);
        var newOrderId = await response.Content.ReadFromJsonAsync<int>();
        OrderState.ResetOrder();
        NavigationManager.NavigateTo("/myorders");
    }
}