using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409

namespace Bubblesort
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        int[] arr = new int[10]; //Legt einen int-Array mit der Länge 10 an.
        String outputstring = "";

        Random randNum = new Random();


        public MainPage()
        {
            this.InitializeComponent();
            //Array wird mit ganzen Zahlen gefüllt
            for (int i = 0; i < arr.Length; i++)
            {
                arr[i] = randNum.Next(1, 100);
            }

            //Umwandeln des Arrays in einen String zur Ausgabe in einem Textfeld
            String inputstring = "";

            for (int i = 0; i < arr.Length; i++)
            {
                inputstring += arr[i] + " | ";
            }

            tbx_input.Text = inputstring;

        }

        public int[] sort(int[] a)
        {
            bool flag = true;
            int temp;
            int numLength = a.Length;
            //sorting an array

            for (int i = 1; (i <= (numLength - 1)) && flag; i++)
            {
                flag = false;
                for (int j = 0; j < (numLength - 1); j++)
                {
                    if (a[j + 1] < a[j])
                    {
                        temp = a[j];
                        a[j] = a[j + 1];
                        a[j + 1] = temp;
                        flag = true;
                    }

                    for (int z = 0; z < a.Length; z++)
                    {
                        outputstring += a[z] + " | ";

                    }
                    outputstring += "\r\n";
                }




            }
            tbx_output.Text = outputstring;
            return a;

        }

        private void b_bubblesort_Click(object sender, RoutedEventArgs e)
        {

            int[] z = sort(arr);




        }
        private void b_quicksort_Click(object sender, RoutedEventArgs e)
        {

            int[] z = sort(arr);




        }
        private void b_insertionsort_Click(object sender, RoutedEventArgs e)
        {

            int[] z = sort(arr);




        }
        private void b_mergesort_Click(object sender, RoutedEventArgs e)
        {

            int[] z = sort(arr);




        }
    }
}
+++++++++++++++++++++++++++++
<Page
    x:Class="Bubblesort.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Bubblesort"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" FontFamily="Century Gothic" Foreground="{x:Null}">

    <Grid Background="Black">
        <TextBlock x:Name="tbl_head" TextWrapping="Wrap" FontSize="100" Text="Sort" FontFamily="Century Gothic" FontWeight="Bold" VerticalAlignment="Top" Foreground="White" Height="98" Margin="0,0,1096,0"/>
        <TextBlock x:Name="tbl_input" TextWrapping="Wrap" Text="INPUT" FontSize="18" FontFamily="Century Gothic" VerticalAlignment="Center" Margin="389,2,843,692" Foreground="White" Height="26"/>
        <TextBox x:Name="tbx_input" Margin="384,0,505,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" FontSize="16" FontFamily="Century Gothic" Foreground="White" Height="128"/>
        <TextBlock x:Name="tbl_output" TextWrapping="Wrap" Text="OUTPUT" FontSize="16" FontFamily="Century Gothic" VerticalAlignment="Center" Margin="780,4,427,694" Foreground="White" Height="22"/>
        <TextBox x:Name="tbx_output" TextWrapping="Wrap" Text="" FontSize="16" FontFamily="Century Gothic" Foreground="White" Height="720" HorizontalAlignment="Right" Width="500" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch"/>
        <Grid HorizontalAlignment="Left" Height="98" Margin="0,622,0,0" VerticalAlignment="Top" Width="385">
            <Button x:Name="b_bubblesort" Content="Bubblesort" HorizontalAlignment="Left" Margin="0,49,0,0" VerticalAlignment="Top" Height="49" Width="200" Click="b_bubblesort_Click" FontFamily="Century Gothic" FontSize="30" Foreground="White"/>
            <Button x:Name="b_mergesort" Content="Mergesort" HorizontalAlignment="Left" Margin="185,49,0,0" VerticalAlignment="Top" Height="49" Width="200" Click="b_bubblesort_Click" FontFamily="Century Gothic" FontSize="30" Foreground="White"/>
            <Button x:Name="b_insertionsort" Content="Insertionsort" HorizontalAlignment="Left" VerticalAlignment="Top" Height="49" Width="200" Click="b_bubblesort_Click" FontFamily="Century Gothic" FontSize="30" Foreground="White"/>
            <Button x:Name="b_quicksort" Content="Quicksort" HorizontalAlignment="Left" Margin="205,0,0,0" VerticalAlignment="Top" Height="49" Width="180" Click="b_bubblesort_Click" FontFamily="Century Gothic" FontSize="30" Foreground="White"/>
        </Grid>

    </Grid>
</Page>