The sharpness control is not available for the selected camera
This VB example uses the minimum and maximum sharpness values to initialize the slider control:
Private SubForm_Load() Slider1.Min = ActiveDcam1.GetSharpnessMin
Slider1.Max = ActiveDcam1.GetSharpnessMax
Slider1.Value = ActiveDcam1.Sharpness
If the currently selected camera doesn't support software sharpness control, the method will generate an error.