C# Program for an Addition of Whole Number in Alternative Way

	string[] strNum = TextBox1.Text.Split(' ');  
            string strFirstNum = strNum[0]; 
            string strSecNum = strNUM[1]; 
            string strLastNum = strNum[2];

            Response.Write(strFirstNum);
            Response.Write("<br>");
            Response.Write(strSecNum);
            Response.Write("<br>");
            Response.Write(strLastNum);

public class Addition
   {
             public static void Main( string[] args )
       {
int num1; 
int num2; 
 int sum; 
         Console.Write( "Enter first integer: " ); 
         num1 = Convert.ToInt32( Console.ReadLine() );

         Console.Write( "Enter second integer: " ); 
         num2 = Convert.ToInt32( Console.ReadLine() );

         sum = num1 + num2; 

         Console.WriteLine( "Sum is {0}", sum ); 

   } 


Results Output

Enter first integer: 50
Enter second integer: 70
Sum is 120

using System;

namespace DemoOops
{
 class Program
 {
  static void Main(string[] args)
  {
    Console.WriteLine("please enter the number...");
    string originalNumber = Console.ReadLine().ToString();
    int i = 0;
    string x = string.Empty, y = string.Empty;
    foreach (char c in originalNumber.ToCharArray())
    {
      if (i % 2 == 0)
        x += c.ToString();
      else
        y += c.ToString();
      i++;
    }
    Console.WriteLine("First Number:" + x.ToString());
    Console.WriteLine("Second Number:" + y.ToString());
    Console.WriteLine("Sum is: " + (Convert.ToInt32(x) + Convert.ToInt32(y)));
    Console.ReadLine();
  }
 }
}