I need to load a file(from local drive) into a rich text box. Then when the program terminates it will find out whether the content in the rich text box is "dirty" -- has been changed. If so save it. If I compare line by line I need to read each line into a string first. However, each line in the file might be longer than the 255 char limit for a string datatype. Also this might take a long time. What other solutions are there?