Hi to all!

I am trying to write a code in windows forms in c# to open two text files and compare them. 

the process is as follows:

1- two text boxes are provided on the window

2- the files are loaded into text boxes using OpenFileDialogue 

3- I want to have the first text as the base and compare the second one to that and highlight the similarities and differences using different colors on the second text.

I actually don't know how to do step 3.

many thanks for your helps!!