Opaidad.

[[nightynvid]]

para los que quieran conocer al hermanito mayor de vb

    public partial class Form1 : Form
    {
        bool bStartDrag = false;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_MouseCaptureChanged(object sender, EventArgs e)
        {
            bStartDrag = !bStartDrag;
            if(!bStartDrag) this.Opacity=1;
            
        }

        private void Form1_LocationChanged(object sender, EventArgs e)
        {
            if(bStartDrag) this.Opacity=0.5;
        }
    }