battleships wpf

<Window x:Class="battleships.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="525" Width="525" ResizeMode="NoResize">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="520" MaxWidth="520" MinWidth="520"/>
            <ColumnDefinition Width="0*"/>
        </Grid.ColumnDefinitions>
        <TextBlock x:Name="maintext" Loaded="Output_Loaded" Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" Text="asd" Foreground="Black" FontSize="18" TextDecorations="{x:Null}" FontFamily="Arial" TextAlignment="Center"/>
        <Button x:Name="startBtn" Height="26" HorizontalAlignment="Left" Margin="403,0,0,0"
            VerticalAlignment="Bottom"
            Width="106" Click="startGame">Start Game</Button>


    </Grid>
</Window>




using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Text.RegularExpressions;

namespace battleships
{
    public partial class MainWindow : Window
    {
        private Random rand;
        private int[,] field;
        private Regex reg;
        private TextBlock output;
        private Button Buttons;
        private Dictionary<string, Button> ButtonDict = new Dictionary<string, Button>();

        public MainWindow()
        {
            InitializeComponent();
            this.rand = new Random();
            this.reg = new Regex(@"^\d,\d$", RegexOptions.IgnoreCase);
            this.CreateField();
        }

        private void Output_Loaded(object sender, RoutedEventArgs e)
        {
            this.output = sender as TextBlock;
        }

        private void startGame(object sender, EventArgs e)
        {
            Button clicked = (Button)sender;
            clicked.Content = "Restart";
            this.output.Text = "The enemy has placed his ships. Ready your weapons";
            this.createButtons();
        }

        private void createButtons()
        {
            for (int i = 0; i < 10; i++)
            {
                for (int j = 0; j < 10; j++)
                {
                    Button newButton = new Button();
                    ButtonDict.Add(i + "," + j , newButton);
                }
            }
        }

        private void CreateField()
        {
            // setup empty field

            this.field = new int[10, 10] {
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0},
                {0,0,0,0,0,0,0,0,0,0}
            };
        }
    }
}