Need help with a threading issue

[Flack]

Hey guys,

I'm trying to read a file and add some nodes to a treee view control. I
would like the GUI to remain interactive and have a progress bar and text box
be updated with info as the file is read.

I'm using a threadpool thread and reading the file from there. However, I
seem to be running into some problems. Sometimes the GUi seems to be
updating/repainting fine but than all of a sudden stops responding. Also, if
the open file dialog is on top off the form, it doesn't repaint at all.

Below is the code I am using. Any help is greatly appreciated.

=============== =============== =============== =

delegate void UpdateProgressB arCallback(deci mal percentDone);
delegate void UpdateFlexbarTr ee(string line);

private void _loadToolStripM enuItem_Click(o bject sender, EventArgs e)
{
Stream fileStream = null;
OpenFileDialog openFileDialog = new OpenFileDialog( );

openFileDialog. InitialDirector y =
Path.GetDirecto ryName(Assembly .GetExecutingAs sembly().GetMod ules()[0].FullyQualified Name);
openFileDialog. Filter = "lua files (*.lua)|*.lua";
openFileDialog. FilterIndex = 1;
openFileDialog. RestoreDirector y = true;

if (openFileDialog .ShowDialog() == DialogResult.OK )
{
try
{
if ((fileStream = openFileDialog. OpenFile()) != null)
{
ThreadPool.Queu eUserWorkItem(n ew
WaitCallback(Cr eateFlexbarTree ), fileStream);
}
}
catch (Exception ex)
{
MessageBox.Show ("Error: Could not read file from disk. Original
error: " + ex.Message);
}
}
}

private void CreateFlexbarTr ee(object fileStreamState _)
{
Stream fileStream = fileStreamState _ as Stream;
using (fileStream)
{
string line;
decimal fileSize = fileStream.Leng th;
decimal percentDone = 0;
using (StreamReader streamReader = new StreamReader(fi leStream))
{
while ((line = streamReader.Re adLine()) != null)
{
ReadLine(line.T rim());
percentDone = (streamReader.B aseStream.Posit ion / fileSize) * 100;
UpdateProgressB ar(percentDone) ;
}
}
}
}

private void UpdateProgressB ar(decimal percentDone_)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
if (_readFileProgr essBar.InvokeRe quired)
{
UpdateProgressB arCallback d = new
UpdateProgressB arCallback(Upda teProgressBar);
Invoke(d, new object[] {percentDone_}) ;
}
else
{
_readFileProgre ssBar.Value = (int)percentDon e_;

//Im not sure but if the textbox is on the same form as the progress
bar, do I need to
//check if Invoke is required for the textbox as well? Either way,
taking out this line didn't seem
//to help
textBox1.Text = percentDone_.To String();
}
}

private void ReadLine(string line)
{
if (_readFileProgr essBar.InvokeRe quired)
{
UpdateFlexbarTr ee d = new UpdateFlexbarTr ee(ReadLine);
Invoke(d, new object[] {line});
}
else
{
if (line.Contains( "FBSavedProfile "))
{
_flexbarDataTre e.Nodes.Add("FB SavedProfile");
}
}
}