Issue tranfering variable to a on click function

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C#

Hello coders, I am having a issue were when I attempt to transfer a randomly generated value in a variable to a on_click function the value appears to be blank and does not transfer over like it should, I really cannot figure out why this issue is occurring so if someone could please help it would be very much appreciated, thank you.

(ps sorry for posting pretty much the entire code but I really could not figure out where I have gone wrong)

What I have tried:

public MainWindow()
        {
            InitializeComponent();
            RandomImage();
        }

        private string correctFlag { get; set; }
        public void RandomImage()
        {
            string[] flags = { "Afghanistan", "Albania", "Algeria", "Andorra", "Angola", "Antigua and Barboda", "Argentina",
                "Armenia", "Australia", "Austria", "Azerbaijan", "Bahamas", "Bahrain", "Bangladesh", "Barbados"};

            Random num = new Random();
            String correctFlag = flags[num.Next(0, flags.Length)];
            String flag2 = flags[num.Next(0, flags.Length)];
            String flag3 = flags[num.Next(0, flags.Length)];
            String flag4 = flags[num.Next(0, flags.Length)];

            String FlagUri = $"flags/flags 3.0/{correctFlag}.png";

            flagBox.Source = new BitmapImage(new Uri(FlagUri, UriKind.Relative));
            RandomButttons(correctFlag, flag2, flag3, flag4);
    }

        public void RandomButttons(string correctFlag, string flag2, string flag3, string flag4)
        {
            Random rnd = new Random();
            int RndButton = rnd.Next(1, 5);
            Console.WriteLine(RndButton);

            if (RndButton == 1)//this works as it should
            {
                Button1.Content = correctFlag;
                Button2.Content = flag2;
                Button3.Content = flag3;
                Button4.Content = flag4;
            }
            else if (RndButton == 2)//this works as it should
            {
                Button2.Content = correctFlag;
                Button1.Content = flag2;
                Button3.Content = flag3;
                Button4.Content = flag4;
            }
            else if (RndButton == 3)//this works as it should
            {
                Button3.Content = correctFlag;
                Button2.Content = flag2;
                Button1.Content = flag3;
                Button4.Content = flag4;
            }
            else if (RndButton == 4)//this works as it should
            {
                Button4.Content = correctFlag;
                Button2.Content = flag2;
                Button3.Content = flag3;
                Button1.Content = flag4;
            }
        }


        private void Button1_clicked(object sender, RoutedEventArgs e)
        {
            //MessageBox.Show(correctFlag); // here the message box just shows a blank box
            if ((string)Button1.Content == correctFlag) // this does not activate because of the issue mentioned above
            {
                MessageBox.Show("good job");
            }
        }

        private void Button2_clicked(object sender, RoutedEventArgs e)
        {
            if ((string)Button2.Content == correctFlag) // this does not activate because of the issue mentioned above
            {
                MessageBox.Show("good job");
            }
        }

        private void Button3_clicked(object sender, RoutedEventArgs e)
        {
            if ((string)Button3.Content == correctFlag) // this does not activate because of the issue mentioned above
            {
                MessageBox.Show("good job");
            }
        }

        private void Button4_clicked(object sender, RoutedEventArgs e)
        {
            if ((string)Button4.Content == correctFlag) // this does not activate because of the issue mentioned above
            {
                MessageBox.Show("good job");
            }
        }