CdonPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace CdonApp
{
    public partial class CdonPage : ContentPage
    {

        string[] options =
        {
            "Xamarin",
            "Unity",
            "iPhone",
            "Android",
            "IoT",
            "C#"
        };
        public CdonPage()
        {
            InitializeComponent();
        }

        void ButtonClicked(object sender, EventArgs args)
        {
            label.Text = options[new Random().Next(options.Length - 1)];
        }
    }
}