Using Single Dimensional Array to Represent Two Dimensional Data

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows;

namespace nPuzzel
{
    class PuzzelPiece : Button
    {
        bool useImage = false;
        public ImageBrush PieceBrush { get; set; }
        public int PieceIndex { get; set; }
        public Point location;

        public bool UseImage 
        {
            get { return useImage; }
            set
            {
                useImage = value;
                SetBackground();
            }
        }

        public PuzzelPiece(int index, ImageBrush pieceBrush)
        {
            this.PieceBrush = pieceBrush;
            this.PieceIndex = index;
            SetBackground();
        }

        public Point Location
        {
            get { return location; }
            set
            {
                this.location = value;
                this.SetValue(Canvas.LeftProperty, location.X);
                this.SetValue(Canvas.TopProperty, location.Y);
            }
        }

        public void SetBackground()
        {
            if (IsEnabled)
            {
                if (UseImage)
                {
                    this.Background = PieceBrush;
                    this.Content = "";
                }
                else
                {
                    this.Background = Brushes.WhiteSmoke;
                    this.Content = PieceIndex + 1;
                }
            }
            else
            {
                this.Background = Brushes.WhiteSmoke;
                this.Content = "";
            }
        }

        public void MakeEmpty()
        {
            this.Content = "";
            this.Background = Brushes.WhiteSmoke;
            this.IsEnabled = false;
        }

        public void MakeActive()
        {
            this.IsEnabled = true;
            if (UseImage)
            {
                this.Background = PieceBrush;
                this.Content = "";
            }
            else
            {
                this.Background = Brushes.WhiteSmoke;
                this.Content = PieceIndex + 1;
            }
        }
    }
}