How to rebind my view to a new data context on visibility change of window

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C#

WPF

MVVM

I have a WPF Window which is bind to viewmodel as data context. On click of a button1 I hide the view.
Now on click of button2 the view is again visible and I have to give a new object of viewmodel as datacontext to it
but scince the window is not reloaded so that doesn't updates the view.

Is it possible to update the view with new ViewModel on visiblity change? Updating my code though its not full mvvm but ultimately i will have to implement it in MVVM

What I have tried:

MainWindow mn; // this is my view

 private void button2_Click(object sender, RoutedEventArgs e)
        {
            IList<Variable> lstVar = new List<Variable>();
            IList<string> mnoList = new List<string>();

            mnoList.Add("MNO1");
            mnoList.Add("MNO2");
            mnoList.Add("MNO3");
            mnoList.Add("MNO4");
            mnoList.Add("MNO5");

            IList<string> mnoList1 = new List<string>();
            mnoList1.Add("MNO4");
            mnoList1.Add("MNO5");

            Variable vr = new Variable("Var123", "opc:123", mnoList1);
            lstVar.Add(vr);
             mn = new MainWindow();
            mn.DataContext = new MainWindowViewModel(lstVar, mnoList);// viewmodel given as datacontext
            mn.ShowDialog();
           
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            mn.Visibility = Visibility.Hidden;
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            IList<Variable> lstVar = new List<Variable>();
            IList<string> mnoList = new List<string>();

            mnoList.Add("MNO1");
           

            IList<string> mnoList1 = new List<string>();
            mnoList1.Add("MNO4");
            mnoList1.Add("MNO5");

            Variable vr = new Variable("Var123", "opc:123", mnoList1);
            lstVar.Add(vr);
            //mn = new MainWindow();
            mn.DataContext = new MainWindowViewModel(lstVar, mnoList);// giving my view datacontext a new object of view model
            mn.ShowDialog();
        }