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Posted 11 Jul 2002

VB.NET Knob Control using Windows Forms and GDI+

, 11 Jul 2002
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User Drawn Control for .NET Winforms using GDI+

Knob Control Image

This code was originally written by Jigar Desai using C#. Naturally, as a VB Programmer, I needed to see if this control could be readily implemented using VB.NET. After many hours of hair pulling, this control has been successfully ported to VB.NET . Additionally, I added a new design-time property to the original control which allows the Knob Color to take on a different color than the control's background. The only change to the original code is the addition of the "KnobColor" Property. I have included the "TestKnobControl" Project to demonstate the use of this control's ValueChanged Event as well as the vast array of different colors now available for the control.

This control implements several interesting techniques, to include: Delegates, Properties, GDI+ and Overriding base methods. Special thanks, from the VB Community, to Jigar for his quick and positive response on my request to post this control in VB.NET.

The original Article for this control can be found on


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Web Developer
United States United States
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Comments and Discussions

QuestionActiveX version Pin
Member 806659323-Nov-14 9:12
memberMember 806659323-Nov-14 9:12 
GeneralTick Marks fix Pin
spoogie22-Sep-07 16:05
memberspoogie22-Sep-07 16:05 
GeneralModification Pin
m1598118-Nov-06 12:59
memberm1598118-Nov-06 12:59 
GeneralVB.NET 2005 Pin
ultra029-Apr-06 17:11
memberultra029-Apr-06 17:11 
I'm trying to use this in VB.NET 2005 but I'm getting some errors when I drag this control onto a form:
'KnobControl' is ambiguous in the namespace 'KnobControl'
'CUtility' is ambiguous in the namespace 'KnobControl'.

Any help would be appreciated. This is a great control.

I also have a feature request if you choose to update this: Could there be an option to turn off the automatic scaling of the tick marks so I could choose the amount? My application uses MIDI and the maximum value is usually 127 (sometimes more) and a lot of tick marks doesn't look very nice. I'd like an option other than turning them off completely.

GeneralUpdate for some Value visualization.. Pin
woo_hoo15-Nov-05 20:31
memberwoo_hoo15-Nov-05 20:31 
QuestionC# version ? Pin
John H Long3-Dec-03 4:33
memberJohn H Long3-Dec-03 4:33 
AnswerRe: C# version ? Pin
blong4-Dec-03 13:59
memberblong4-Dec-03 13:59 
GeneralRe: C# version ? Pin
John H Long7-Dec-03 3:18
memberJohn H Long7-Dec-03 3:18 
GeneralRe: C# version ? Pin
Michal Brylka8-Feb-07 7:30
memberMichal Brylka8-Feb-07 7:30 
GeneralBug... Pin
Francois Germain17-Feb-03 16:33
memberFrancois Germain17-Feb-03 16:33 
GeneralRe: Bug... Pin
blong18-Feb-03 9:58
memberblong18-Feb-03 9:58 
GeneralRe: Bug... A fix of the cause of the error Pin
tntiger26-Sep-03 7:59
membertntiger26-Sep-03 7:59 
GeneralA couple of questions... Pin
Josh Martin12-Jul-02 13:31
memberJosh Martin12-Jul-02 13:31 

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