How to compare two word document and give the result using c#

Question

Hi, all I am developing a C# application that will able to give typing practice to people in that I want to compare two documents and give the result like correct or incorrect by comparing the text inside it after the user editing it compared with the correct word document.

The process is a user attempts the question a word will be opened automatically in that content will as below:-

1.Characters

2.Charaters.

now the user will correct the spelling mistake in the document opened and it should the compare with a correct file which is in the backend and show the result as correct or else incorrect at a particular line and the correction is "c" so how can we do that can anyone give any methods to do it ??