undersatnding making funcations in c3 code example

Example 1: How to make a function in C#

public void SayHello(string name) 
{
    Console.WriteLine("Hello")  
}


Console.WriteLine("What is your name?")
string name = Console.ReadLine() ; 

SayHello(Adam)

Example 2: function c#

public int AddNumbers(int number1, int number2)
{
    int result = number1 + number2;
    return result;
}