how to Acces a Button/Textbox..... from mainwindow in class

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Im new at OOP and im wondering how i can say in my edit Class, get this textbox from the mainwindow and clear it. I tried this:

public partial class MainWindow : Window
    {
        Edit edit = new Edit();
        public MainWindow()
        {
            InitializeComponent();
           
        }

        private void ClearBtn_Click(object sender, RoutedEventArgs e)
        {
            //TxtBox.Clear();
            edit.Clear();
            
        }
    }

Edit class

public class Edit
    {
        MainWindow main = new MainWindow();

        public void Clear()
        {
            main.TxtBox.Clear();
          
        }
        public Edit()
        {
            
        }

    }


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