System.Windows.Forms.ColorPickerForm.HuePicker.OnMouseMove C# (CSharp) Method

            protected override void OnMouseMove(MouseEventArgs e)
            {
                // Pretty slow.

                /*if (_mouseDown)
                {
                    Hue = (float)e.Y / Height;
                    if (Hue < 0) Hue = 0;
                    if (Hue > 1) Hue = 1;
                }*/
            }
            protected override void OnMouseUp(MouseEventArgs e)