I was having problems with this overloaded method.......mySort.quickSort(data.Length - 1); it is only sending one para. over to this method.......public void quickSort(int first, int last). Where is the second para for this method??
Thanks for you time, this has been a great book so far!!!

private void btnSort_Click(object sender, EventArgs e)
{
int i;
clsSort mySort = new clsSort(data);

mySort.quickSort(data.Length - 1);

for (i = 0; i < data.Length; i++)
{
lstSorted.Items.Add(data[i].ToString());
}



public void quickSort(int first, int last)
{
int start;
int end;

start = first;
end = last;

if (last - first >= 1)
{
int pivot = data[first];

while (end > start)
{

while (data[start] <= pivot && start <= last && end > start)
start++;

while (data[end] > pivot && end >= first && end >= start)
end--;
if (end > start)
swap(start, end);
}
swap(first, end);
quickSort(first, end - 1);
quickSort(end + 1, last);
}
else
{
return;
}
}

My bad...

If you look at the code that's available on the Wrox website, you'll see that the source has the call as:

mySort.quickSort(0, data.Length - 1);

Somehow, the first argument got dropped and neither I nor the tech ed caught it. As a general rule, if you see something in the book that looks stupid, first check the source available on the web to see if it's different there. Usually, that code's correct since it is never editted. If that doesn't fix it, then we've done something even more stupid...

Sorry for the error...

__________________
Jack Purdum, Ph.D.
Author: Beginning C# 3.0: Introduction to Object Oriented Programming (and 14 other programming texts)