C# values between functions

In c#, the Type of a value is really important. When you read from the console, you get a string. However, your Age() and NUMBER() functions return ints. A function that is declared to return an int cannot return a string. You need to convert those values to int before you can return them:

public int AGE() {
    Console.WriteLine(" And enter age: ");
    return int.Parse(Console.Read());
}

After you fix both functions, you can call Name() like this:

public Program()
{
    int x = AGE();
    int y = NUMBER();
    Name(x, y);
}

or like this:

public Program()
{
    Name(AGE(), NUMBER());
}

In either case, if you want to pass those values to the Name() function, the calls to AGE() and NUMBER() must be resolved before the the call to Name(). The console text indicates you want the prompts in Name() to come first. In that case, you might do this:

public void Name()
{
    Console.WriteLine("Enter your name: ");
    string test = Console.ReadLine();
    Console.WriteLine("Hi " + test);
    int age = AGE();
    int number = NUMBER();
}

public Program()
{
    Name();
}

For educational purposes:

public Program()
{
    var age = AGE();
    var num = NUMBER(); 
    Name(age, num);
}

When a function returns a value, you need to store it or use it immediately. If you look at your example, in the AGE method, you have

    x = Console.Read();

Console.Read is returning the value you're storing in x. But this x is local to the AGE method, nothing else called x will have that value (its scope is local to the AGE method). The AGE method returns this value, but that doesn't mean you can use the variable x anywhere else.

When you call AGE in the Program constructor, you need to save its return value. If you have that value saved, then you can pass it in as an argument to Name.

    int age = AGE();
    Name(age, y);

(assuming y is set by your call to NUMBER). When Name is called, you'll be able to use x, and it will have the value you passed in (which above, is called age).

A few comments:

• Console.Read only read one character and returns the UTF-16 code of that character - you should use Console.ReadLine instead and parse the results if necessary.
• Functions should be named to describe what they do, so GetAge and GetName would be more appropriate function names
• Constructors should only be used to initialize the object to a usable state. Your code should either be in the Main function or in a separate function of Program that Main calls.
• variables should have meaningful names. x and y do not give any indication of what they represent.

So something like this would be more appropriate:

class Program
{
    public void Run()
    {
        int age = GetAge();
        int number = GetNumber();
        GetName(age, number);
    }
    public int GetAge(){
        string age;
        Console.WriteLine(" And enter age: ");
        age = Console.ReadLine();
        return int.Parse(x); // or TryParse and loop until the parse succeeds
    }
    public int GetNumber(){
        string number;
        Console.WriteLine(" And favorite number: ");
        number = Console.ReadLine();
        return int.Parse(number); // or TryParse and loop until the parse succeeds

    }
    public void Name(int x, int y)
    {
        Console.WriteLine("Enter your name: ");
        string test = Console.ReadLine();
        Console.WriteLine("Hi " + test);
    }
    static void Main(string[] args) {
        new Program().Run();
        Console.ReadLine();
    }
}