MAUI class constructor not attaching to list view

hi, trying to attach class constructor to basic listview. according to my logic this should work but somehow how it is not attaching to list view despite code runs ok;

using System.Collections.ObjectModel;
using System.Reflection.Metadata.Ecma335;
using System.Security.Cryptography.X509Certificates;

namespace MauiApp12;
public partial class MainPage : ContentPage
{
    public class MyVariables
    {
        string myst { get; set; }
                public MyVariables(string a)
        {
        myst = a;
        }
    }
    public ObservableCollection<MyVariables> variables { get; set; } = new ObservableCollection<MyVariables>() {new MyVariables("hello sir how are you")};
    //public ObservableCollection<MyVariables> variables { get; set; } = new ObservableCollection<MyVariables>() { new MyVariables { name = "adfdlkjlkjlksdf"; } };
    //ListView lv1 = new ListView();
    public MainPage()
    {
        InitializeComponent();
    }
    private void OnCounterClicked(object sender, EventArgs e)
    {
        lv.ItemsSource = variables;
        //lv.SetBinding(ItemsView.items, "variables");
    }
    }

version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiApp12.MainPage">

    <ScrollView>
        <VerticalStackLayout
            Spacing="25"
            Padding="30,0"
            VerticalOptions="Center">

            <ListView x:Name="lv" ItemsSource="{Binding variables}" />
            <Image
                Source="dotnet_bot.png"
                SemanticProperties.Description="Cute dot net bot waving hi to you!"
                HeightRequest="200"
                HorizontalOptions="Center" />

            <Label
                Text="Hello, World!"
                SemanticProperties.HeadingLevel="Level1"
                FontSize="32"
                HorizontalOptions="Center" />

            <Label
                Text="Welcome to .NET Multi-platform App UI"
                SemanticProperties.HeadingLevel="Level2"
                SemanticProperties.Description="Welcome to dot net Multi platform App U I"
                FontSize="18"
                HorizontalOptions="Center" />

            <Button
                x:Name="CounterBtn"
                Text="Click me"
                SemanticProperties.Hint="Counts the number of times you click"
                Clicked="OnCounterClicked"
                HorizontalOptions="Center" />

        </VerticalStackLayout>
    </ScrollView>

</ContentPage>