method inside the button click

class Auto 
    {
        public int RegNumber;
        public string ModelName;
public void dispaly()
        {
        }
}

private void btnok_Click(object sender, RoutedEventArgs e)
        {
            //Object creating using " new " Keyword
            Auto AutoTest = new Auto();
            AutoTest.ModelName = txtmodelname.Text ;
            AutoTest.RegNumber = int.Parse(txtregnumber.Text);
            // output
            txtresult.Text = "RegNumber :  " + AutoTest.RegNumber.ToString() + "\n" + "ModelName : " + AutoTest.ModelName.ToString();
        }

        private void btnprint_Click(object sender, RoutedEventArgs e)
        {

        }

i want to method display()

inside the

private void btnprint_Click(object sender, RoutedEventArgs e)
        {

        }

that's mean first button for read the user input

second button for output 

that's button calling display() method then print the user input

 public sealed partial class Page4 : Page
    {
        public Page4()
        {
            this.InitializeComponent();
        }

        private void btnok_Click(object sender, RoutedEventArgs e)
        {
            //Object creating using " new " Keyword
            Auto AutoTest = new Auto();
            AutoTest.ModelName = txtmodelname.Text ;
            AutoTest.RegNumber = int.Parse(txtregnumber.Text);
            // output
            txtresult.Text = "RegNumber :  " + AutoTest.RegNumber.ToString() + "\n" + "ModelName : " + AutoTest.ModelName.ToString();
        }

        private void btnprint_Click(object sender, RoutedEventArgs e)
        {

        }

        
    }