Beginner Problem with StreamWriter

I am using StreamWriter to debug a stock trading program and my code creates the file, but will not write to it. I am sure I am missing something simple. I know the method is being used because the D() command you see writes to a debug window. I am not sure what I am missing but the file is created, but always empty.

public class SterlingDebug : ResponseTemplate

{

StreamWriter writer = new StreamWriter(@"C:\Documents and Settings\ecoarsey\SterlingIssue10222010.txt");

int i = 0; public override void GotTick(Tick tick) {

i++; if (i < 11) { D(tick.ToString()); writer.WriteLine("Tick #: {0}",i); }

}