MainPage.xaml.cs

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

namespace AmazingAwesomeApp
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }
        bool x = true;
        void Handle_Clicked(object sender, System.EventArgs e)
        {
            ((Button)sender).BackgroundColor = x==true ? Color.Pink : Color.SandyBrown;
            x = x == true ? false : true;
        }
    }
}