public partial class Maze Form private Stream fileStream private int m

public partial class Maze : Form
    {
        private Stream fileStream;
        private int[,] matrix;
        private int N;
        private int M;

        private Bitmap map;
        private Graphics canvas;

        public Maze()
        {
            InitializeComponent();
        }

        private void browseFile_Click(object sender, EventArgs e)
        {
            fileStream = FileWork.BrowseFile();
            comboBox.SelectedItem = null;
        }

        private void startBtn_Click(object sender, EventArgs e)
        {
            try
            {
                map = new Bitmap(canvasBox.Size.Width, canvasBox.Size.Height);
                canvas = Graphics.FromImage(map);

                FileWork.GetSize(fileStream, out N, out M);
                matrix = FileWork.SaveMatrix(fileStream, N, M);
                Draw draw = new Draw(matrix, canvas, canvasBox.Width, canvasBox.Height, N, M);

                draw.DrawGrid();
                draw.BreakWalls();

                canvasBox.Image = map;
                canvas.Dispose();

                fileStream.Dispose();
            }
            catch{}
        }
    }