Simple Computer Program in C#

Want to achieve following thing using C# Programming

I need a simple computer program that "search" a specific text of my choosing in a series of webpages that I Prodivde.

For Example,

Website X, Y and Z.

Keyword is "Find".

So the program will try to find the keyword in each of the websites,
X, Y, and Z.

And when it finds it, it will report some positive or customize message.

If it does not find it, it will report some negative or customize message.