Revise paste Sorted List

using System;
using System.Text.RegularExpressions;
using System.IO;
using Mono.CSharp;
using Android.Widget;
using Android.Content;
using Android.Views.InputMethods;
using System.Threading.Tasks;
using NativeUiLib; //This ads the GUI contols. Minor abstractions over Xamarin.Android/Mono.Android
namespace SORTED
{
	public static class Program
	{
		public static async void Main()
		{
			var Bolas = "01234567890987654321012345678901234567890123456789";
			string lista = null;
			int[] sf = new int[10];
			int z=0;
			var sort = new char[5]; var bola = new Random(); 
			var lay1 = new LinearLayout();
			//lay1.Orientation = Android.Widget.Orientation.Vertical;
			
			var lbl = lay1.AddTextView();
			var valor = lay1.AddEditText(true);
			
			
			//var lay2 = new LinearLayout();
			//lay2.Orientation = Android.Widget.Orientation.Horizontal;
			int N = 50000;
			var btn = lay1.AddButton();
			var btn1 = lay1.AddButton();
			var lbl1 = lay1.AddTextView();
			
			lbl1.SetPadding(4,5,5,0);
			if (valor.Text != "")
			{
				N = Convert.ToInt32(valor.Text);
			}
			string[] sorteo = new string[N]; 
			lbl.Text = " Xamarin.Forms/Mono.Android/App ";
			btn.Text = " SORTEAR ";
			btn1.Text = " BORRAR ";
			lay1.Show(); Console.Clear();
			//lay2.Show();
			await Task.Delay(300);
			btn.Click += delegate
			{
				if (valor.Text != "")
				{
					N = Convert.ToInt32(valor.Text);
				}
				lista = null;
				for(int j=0; j<N; j++)
				{
					for (int i=0; i < sort.Length; i++)
					{
						sort[i] = Bolas[bola.Next(Bolas.Length)];
					}
					sorteo [j] = new String(sort);
				}
				for(int k=0; k<N; k++)
				{
					lista = lista + sorteo[k] + "  ";
				}
				for (int i=0; i<10; i++)
				{
					sf[i]=0; z=0;
					for(int j=0; j<N; j++)
					{
						string x = Convert.ToString(sorteo[j][4]);
						if (x == $"{i}")
						{
							z++;
						}
					}
					sf[i]=z;
				}
				lbl1.Text = $"Terminaciones de 0, 1, 2, 3, 4, 5, 6, 7, 8 y 9 respectivamente:\n {sf[0]},{sf[1]},{sf[2]},{sf[3]},{sf[4]},{sf[5]},{sf[6]},{sf[7]},{sf[8]},{sf[9]}\n\n" + lista;
			};
			btn1.Click += delegate
			{
				lbl1.Text = "";
				valor.Text = "";
				N=0;
				for (int i=0; i<10; i++)
				{
					sf[i]=0;
				}
			};
		}
	}
}