How to check if image object is the same as one from resource?

by 
     if (pictureBox1.Image == Labirint.Properties.Resources.first)

There’s a trap here that not enough .NET programmers are aware of. Responsible for a lot of programs that run with bloated memory footprints. Using the Labirint.Properties.Resources.xxxx property creates a new image object, it will never match any other image. You need to use the property only once, store the images in a field of your class. Roughly:

    private Image first;
    private Image reitmi;

    public Form1() {
        InitializeComponent();
        first = Labirint.Properties.Resources.first;
        reitmi = Labirint.Properties.Resources.reitmi;
        pictureBox1.Image = first;
    }

And now you can compare them:

    private void pictureBox1_Click(object sender, EventArgs e) {
        if (pictureBox1.Image == first) pictureBox1.Image = reitmi;
        else pictureBox1.Image = first;
    }

And to avoid the memory bloat:

    private void Form1_FormClosed(object sender, FormClosedEventArgs e) {
       first.Dispose();
       reitmi.Dispose();
    }

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