Passing data from list to new view xamarin - xamarin

Question

Ive created a picker with data inside, when selected the data is added to a list. I want to the values that are added to the list to follow to the next page when calculate button is pressed.. tried a few different approaches but i cant get it right..
.cs
// add from picker to listview function
ObservableCollection<LayersClass> listProducts = new ObservableCollection<LayersClass>();
private void MainPicker_SelectedIndexChanged(object sender, EventArgs e)
{
// feedback popup box
var product = MainPicker.Items[MainPicker.SelectedIndex];
DisplayAlert(product, "Layer added to calculation list", "OK");
// if selected add to list
if (null != product)
{
LayersClass layer = new LayersClass();
layer.Product = product;
listProducts.Add(layer);
}
}
//calculate button
private async void Button_Clicked(object sender, EventArgs e)
{
// send selected values to CalculationPage ??
await Navigation.PushAsync(new CalculationPage());
}
xaml:
<ListView
x:Name="productsListView"
HasUnevenRows="False"
HorizontalOptions="FillAndExpand"
VerticalOptions="FillAndExpand"
BackgroundColor="White">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Clicked="MenuItem_Clicked" Text="Delete" IsDestructive="true" CommandParameter="{Binding .}" />
</ViewCell.ContextActions>
<StackLayout>
<Label Text="{Binding Product}"></Label>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Button Margin="0,0,0,90" Text="Calculate" Clicked="Button_Clicked" FontSize="Medium" TextColor="#00AB8E" HorizontalOptions="Center" BackgroundColor="Transparent"/>

Answer 1

You should use parameter to pass data to the another page.
private async void Button_Clicked(object sender, EventArgs e)
{
// send selected values to CalculationPage ??
//Also you should write there an event.
var item = sender as Button;
var selectedItem = item as LayersClass;
await Navigation.PushAsync(new CalculationPage(item));
}
public CalculationPage(string item){
//when you type here dot after typing item like this -> item. you can see the layerclass items.
}