how to have a public textbox without stack overflow error wpf-CodePudding

Forgive me as I am very new but what am I doing wrong here? I am just trying to create a couple of public text boxes... and I am getting a stack overflow error

namespace WpfApp3
{
    public partial class MainWindow : Window
    {
        public Canvas all = new Canvas();
        public System.Windows.Controls.TextBox t12 = new System.Windows.Controls.TextBox();
        public System.Windows.Controls.TextBox t13 = new System.Windows.Controls.TextBox();
        public readonly Window hi = new MainWindow();

<Window x:Class="WpfApp3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp3"
        mc:Ignorable="d"
        Title="MainWindow" Height="1080" Width="1920" WindowStartupLocation="Manual" Topmost="True">
    <Grid>
    </Grid>
</Window>

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