C#

/// <summary>
/// This function returns a <see cref="System.Single"/>
/// </summary>
public float MyFunction()
{
    // your code
}

this.SetStyle (ControlStyles.DoubleBuffer, true);

private const int WM_ENTERSIZEMOVE = 0x0231;
private const int WM_EXITSIZEMOVE = 0x0232;

protected override void WndProc(ref Message m)
{
    base.WndProc(ref m);

    switch (m.Msg)
    {
        case WM_ENTERSIZEMOVE:
            this.Opacity = 0.5;
            break;
        case WM_EXITSIZEMOVE:
            this.Opacity = 1.0;
            break;
    }

    this.Invalidate();
}

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Programm3r
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