Program to Add two 50 digit numbers in C#

	using System;
	namespace BigNumberAddition
	{
	class Addition
	{
	static void Main(string[] args)
	{
	int[] firstNumber = new int[50] {
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5
	};
	int[] secondNumber = new int[50] {
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5, 6, 7, 8, 9,
	1, 2, 3, 4, 5
	};
	int[] resultNumber = new int[50];
	int temp = 0;
	for (int i = firstNumber.Length - 1; i >= 0; i--)
	{
	resultNumber[i] = firstNumber[i] + secondNumber[i] + temp;
	if (resultNumber[i] > 9 && i != 0)
	{
	temp = Convert.ToInt32(resultNumber[i].ToString().Substring(0, resultNumber[i].ToString().Length - 1));
	resultNumber[i] = Convert.ToInt32(resultNumber[i].ToString().Remove(0, resultNumber[i].ToString().Length - 1));
	}
	else
	temp = 0;
	}
	Console.WriteLine("First " + firstNumber.Length + " digits number: ");
	foreach (int i in firstNumber)
	Console.Write(i);
	Console.WriteLine("\n\nSecond " + secondNumber.Length + " digits number: ");
	foreach (int i in secondNumber)
	Console.Write(i);
	Console.WriteLine("\n\nResultant number after addition: ");
	foreach (int i in resultNumber)
	Console.Write(i);
	Console.ReadKey();
	}
	}
	}

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Output is: