You are not "getting any thought" because you are not studying and researching what you
need to know: what you ask involves the most basic aspects of programming in C#/.NET:
1. reading keyboard input in the Console window
2. selectively responding to keyboard input, invoking code you wish executed.
3. writing to the Console window
I suggest you get a good basic book on C# like ".NET Book Zero" by Charles Petzold: free download here: [
^] and get to work.