What is the source of this C# MAUI ListView Warning: Microsoft.Maui.Controls.Xaml.Diagnostics.BindingDiagnostics: Warning: property not found

I'm new to .net MAUI and I'm trying to understand why I'm getting a warning in this very simple single page project.

The code below runs fine on both Windows and Android, in that it correctly displays a list of voters that I have in an SQLite database, however I am get warnings in my debug log as I populate the ListView and I'd like to fix them.

The code and the warnings are below.

MainPage.xaml

<?xml 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="SOTest.MainPage">
<ScrollView>
<VerticalStackLayout>
<Button 
Text="Search"
Clicked="OnButtonClicked" />
<ListView 
x:Name="MyListView"
ItemsSource="{Binding DataToDisplay}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<VerticalStackLayout Padding="5">
<Label Text="{Binding first_name}" />
<Label Text="{Binding last_name}" />
</VerticalStackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</VerticalStackLayout>
</ScrollView>
</ContentPage>

MainPage.xaml. cs

using SQLite;
using System.Diagnostics;
using System.Collections.ObjectModel;
namespace SOTest;
public partial class MainPage : ContentPage
{
//--- Data Model
public class MyDataModel
{
[PrimaryKey, AutoIncrement]
public int voter_id { get; set; }
public string first_name { get; set; }
public string last_name { get; set; }
public string street_name { get; set; }
}
//--- Database Constants
public static class DatabaseConstants
{
public const string DatabaseFilename = "TestDatabase.db3";
public const SQLite.SQLiteOpenFlags Flags =
// open the database in read/write mode
SQLite.SQLiteOpenFlags.ReadWrite |
// create the database if it doesn't exist
SQLite.SQLiteOpenFlags.Create |
// enable multi-threaded database access
SQLite.SQLiteOpenFlags.SharedCache;
public static string DatabasePath =>
Path.Combine(FileSystem.Current.AppDataDirectory, DatabaseFilename);
}
//--- Database Operations
SQLiteAsyncConnection Database;
public async Task SetUpDb()
{
if (Database is not null)
return;
Database = new SQLiteAsyncConnection(DatabaseConstants.DatabasePath, DatabaseConstants.Flags);
await Database.CreateTableAsync<MyDataModel>();
}
public async Task AddRecord(MyDataModel myRecord)
{
await SetUpDb();
await Database.InsertAsync(myRecord);
Debug.WriteLine($"Inserted {myRecord.first_name} {myRecord.last_name}");
}
public async Task<List<MyDataModel>> GetSomeRecords(string LastNameFilter)
{
await SetUpDb();
return await Database.QueryAsync<MyDataModel>("SELECT * FROM [MyDataModel] WHERE [last_name] = '" + LastNameFilter + "' COLLATE NOCASE");
}
public async Task<List<MyDataModel>> GetAllRecords()
{
await SetUpDb();
return await Database.Table<MyDataModel>().ToListAsync();
}
//--- Observable Collection
public ObservableCollection<MyDataModel> DataToDisplay { get; set; }
//--- Main Page and Event Handlers
public MainPage()
{
InitializeComponent();
DataToDisplay = new ObservableCollection<MyDataModel>() { };
BindingContext = this;
}
protected override async void OnAppearing()
{
base.OnAppearing();
await SetUpDb();
MyDataModel Record1 = new MyDataModel();
Record1.first_name = "Albert";
Record1.last_name = "Albertson";
await AddRecord(Record1);
MyDataModel Record2 = new MyDataModel();
Record2.first_name = "Betty";
Record2.last_name = "Boop";
await AddRecord(Record2);
MyDataModel Record3 = new MyDataModel();
Record3.first_name = "Chris";
Record3.last_name = "Kringle";
await AddRecord(Record3);
}
//--- Button Click Initiates the Query and ListView Population
private async void OnButtonClicked(object sender, EventArgs e)
{
DataToDisplay.Clear();
var MyList = await GetAllRecords();
if (MyList.Count > 0)
{
var i = 0;
foreach (var item in MyList)
{
Debug.WriteLine($"Adding {item.first_name}");
DataToDisplay.Add(item);
i++;
}
}
else 
{
Debug.WriteLine("No Records");
}
}
}

Output

Here's what it looks like after pressing the Search button on Windows:

Warning Message

Below are the warnings I receive while populating my ListView:

Adding Albert
Adding Betty
Microsoft.Maui.Controls.Xaml.Diagnostics.BindingDiagnostics: Warning: 'first_name' property not found on 'SOTest.MainPage', target property: 'Microsoft.Maui.Controls.Label.Text'
Microsoft.Maui.Controls.Xaml.Diagnostics.BindingDiagnostics: Warning: 'last_name' property not found on 'SOTest.MainPage', target property: 'Microsoft.Maui.Controls.Label.Text'
Adding Chris
Microsoft.Maui.Controls.Xaml.Diagnostics.BindingDiagnostics: Warning: 'first_name' property not found on 'SOTest.MainPage', target property: 'Microsoft.Maui.Controls.Label.Text'
Microsoft.Maui.Controls.Xaml.Diagnostics.BindingDiagnostics: Warning: 'last_name' property not found on 'SOTest.MainPage', target property: 'Microsoft.Maui.Controls.Label.Text'
Microsoft.Maui.Controls.Xaml.Diagnostics.BindingDiagnostics: Warning: 'first_name' property not found on 'SOTest.MainPage', target property: 'Microsoft.Maui.Controls.Label.Text'
Microsoft.Maui.Controls.Xaml.Diagnostics.BindingDiagnostics: Warning: 'last_name' property not found on 'SOTest.MainPage', target property: 'Microsoft.Maui.Controls.Label.Text'

What do i need to do to eliminate these warnings?

THANK YOU for any suggestions!

add a DataType to the DataTemplate

<DataTemplate x:DataType="myxmlns:MyDataType">