How to compare the contents of two text files received from notepad??

Question

How to compare the contents of two text files for example notepad?

Shen Hengbin · Answer

By tool : WinMerge  DF or any other file compare app By code(c#) : File . WriteAllLines ( FileC.txt  File . ReadAllLines ( FileB.txt ). Except ( File . ReadAllLines ( FileA.txt )));