Some TrackBar settings use excessive CPU and RAM.

How to reproduce:

1. In VS 2005 or VS 2003, Create a new WinForms app (the code below is C#,
but it works in any .NET language)
2. Drop a button and a trackbar component on the form.
3. Double click on the button, and enter this code:
           trackBar1.Minimum = 0;
           /// Uncomment the lines below, and your high CPU usage goes
down:
           //trackBar1.LargeChange = 10000000;
           //trackBar1.TickFrequency = 1000000;
           trackBar1.Maximum = 38389344; // this line uses up 150-megs of
RAM outside the .NET heap!
4. Run the app, and observe the memory usage in the task manager (it uses
about 10 megs of RAM)
5. Click on the button: RAM usage for the app goes to 160 megs immetiately,
followed by a couple of seconds of high CPU-usage
6. quit the app
7. Uncomment these two lines in the code:
           trackBar1.LargeChange = 10000000;
           trackBar1.TickFrequency = 1000000;
8. Run the app, and observe the memory usage in the task manager (it uses
about 10 megs of RAM)
9. Click on the button: RAM usage for the app goes to 160 megs immetiately,
but no high CPU usage

The memory used is outside the .NET heap.
It fails on both English and Dutch Windows XP versions with SP2 installed.

If you make Maxium smaller, you get similar results:

Maximum: Memory usage delta
38389344: 150 megs
3838934: 15 megs
383893: 1,5 megs

Roughly, it looks like the TrackBar uses 4 bytes each time Maximum increased
by one.

Why?

Basically, it makes the TrackBar unusable for large Maximum values.

How to work around that?

Regards

--jeroen