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Form fade out

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    Form FormToFadeOut = (Form)sender;
    float Step = (float)(100f / 20);
    float Opacity = 100f;
 
    for (byte b = 0; b < 10; b++)
    {
        FormToFadeOut.Opacity = Opacity / 100;
        FormToFadeOut.Refresh();
        Opacity -= Step;
    }
}

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As the title says, fades out a form. Replace FormToFadeOut with the form name you want to fade out.