If I am understanding it correctly, use a simple I/O operation.
using(StreamWriter writer = new StreamWriter("debug.txt", true))
{
foreach (string item in lstFilesFound.Items)
{
writer.WriteLine(item.ToString());
}
}
Few extra pointers:
In DirSearch, create a variable for Directory.GetDirectories(sDir)
. Your present code is causing this thing to calculate in every loop. Look for some more similar refactoring code in other areas.
var dirs = Directory.GetDirectories(sDir);
foreach (string d in dirs)
{
var files = Directory.GetFiles(d, txtFile.Text);
foreach (string f in files)
{
lstFilesFound.Items.Add(f);
}
DirSearch(d);
}
Hope it helps.