private void BUT_vidfile_Click(object sender, EventArgs e)
{
String fileName = GetFileName("Videos (*.avi)|*.avi;*.mpe;*.mpeg;*.mp4", txtAviFileName);
if (fileName != null)
{
// update name before calling next function
txtAviFileName.Text = fileName;
// load setting if they exist
loadconfig();
// force file we just picked as video
txtAviFileName.Text = fileName;
}
}