is there a way to force write?

with my c# application it seems that when i use MyStreamWriter.Write within a very repetitve loop, it doesnt seem to write to the file untill the whole batch (loop) is done, is there a way to force it to write eachtime MyStreamWriter.Write is encountered (something like doevents() for ui)

 

i just used append but strangly it seems to append one line and no longer append any more :S