scrollbar thumbtrack woes

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I am having some issues with the standard Windows scrollbar. I am using MS
Visual Studio 2005. Code is C#. The application is a Windows Forms app. The
tool is a vertical scroll bar from the toolbox.

I am attempting to perform a simple operation on a global class variable
(not a methods local variable) such as an integer increment (like myInt++ ).
Grabbing the scroll bar and dragging it produces the thumbtrack event in the
scroll method. I notice that if I grab the scroll bar and drag it down
quickly, the variable is only incremented occasionally. If I drag it slowly
enough, the variable is incremented correctly.

The scroll method seems to be called, but the variable is not updated. The
other scroll events ( SmallIncrement, SmallDecrement etc) are slow enough to
allow the variable to be updated correctly.

How can I get the variable to be updated each time the scroll thumbtrack
event fires???

Here's the code to reproduce the problem. Very simple.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace scrollbar
{
public partial class Form1 : Form
{
int myInt = 0;

public Form1()
{
InitializeComponent();
}

private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
{
if (e.Type == ScrollEventType.ThumbTrack)
{
myInt++;
textBox1.Text = Convert.ToString(myInt);
}
} // end method
} // end class
} // end namespace

--
Sam