inputs in methods at visual c# 2005

I am facing a problem in creating a console application in Visual Studio c# 2005

I created the follo开发者_运维百科wing program in which a method (to sum 2 predefined values) is called in the program

here is the code of it

class program
{
    static void Main()
    {
        program a;
        a = new program();
        Console.WriteLine(a.am1(1,2));
        Console.ReadLine();
    }
    int sum;
    public int am1(int num1, int num2)
    {
        sum = num1 + num2;
        return sum;
    }
}

Now here is the main problem I am facing, well in this program two integers (num1 and num2) are predefined, I wanted those 2 numbers to be taken from user, means user input the two numbers and then the same program goes on like above. How it should be done?

P.S remember everything should be done in methods

i hope i got your requirements ... if not, please elaborate!

public sealed class Program
{
    private readonly int _number1;
    private readonly int _number2;

    public Program(int number1, int number2)
    {
        this._number1 = number1;
        this._number2 = number2;
    }

    public int Sum()
    {
        return this._number1 + this._number2;
    }

    public static void Main(string[] args)
    {
        // this one here is really brutal, but you can adapt it
        int number1 = int.Parse(args[0]);
        int number2 = int.Parse(args[1]);
        Program program = new Program(number1, number2);
        int sum = program.Sum();
        Console.WriteLine(sum);
        Console.ReadLine();
    }
}

sry, this is not my main coding style ... pfuh ... really ugly!

edit:

1. don't give blind trust in int.Parse(). the params are coming from the user, you better double check them!
2. you better triple check them, as you are doing a sum ... thankfully c# compiles with unchecked - this code may fail with an OverflowException if compiled in vb - remember ranges of int
3. why do you want to do a simple addition in an extra class?
4. you should elaborate your style (regarding your comment): separate ui-code from business-layer code!
5. you do not need to create an instance variable for each task - you can do that with scope variables too...!
6. ...

Use console application command line arguments. If it suites you. Below is an example from MSDN.

 public class Functions
    {
        public static long Factorial(int n)
        {
            // Test for invalid input
            if ((n < 0) || (n > 20))
            {
                return -1;
            }

            // Calculate the factorial iteratively rather than recursively:
            long tempResult = 1;
            for (int i = 1; i <= n; i++)
            {
                tempResult *= i;
            }
            return tempResult;
        }
    }

    class MainClass
    {
        static int Main(string[] args)
        {
            // Test if input arguments were supplied:
            if (args.Length == 0)
            {
                System.Console.WriteLine("Please enter a numeric argument.");
                System.Console.WriteLine("Usage: Factorial <num>");
                return 1;
            }

            // Try to convert the input arguments to numbers. This will throw
            // an exception if the argument is not a number.
            // num = int.Parse(args[0]);
            int num;
            bool test = int.TryParse(args[0], out num);
            if (test == false)
            {
                System.Console.WriteLine("Please enter a numeric argument.");
                System.Console.WriteLine("Usage: Factorial <num>");
                return 1;
            }

            // Calculate factorial.
            long result = Functions.Factorial(num);

            // Print result.
            if (result == -1)
                System.Console.WriteLine("Input must be >= 0 and <= 20.");
            else
                System.Console.WriteLine("The Factorial of {0} is {1}.", num, result);

            return 0;
        }
    }
    // If 3 is entered on command line, the
    // output reads: The factorial of 3 is 6.