I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability..

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
public class csharpExercise
{
    static void Main(string[] args)
    {
 
        int num, last;
 
        // Reading number
        Console.Write("Enter any number: ");
        num = Convert.ToInt32(Console.ReadLine());
 
        last = num % 10;
        Console.WriteLine("The last digit of entered number: "+ last);
 
        while (num >= 10)
        {
            num = num / 10;
        }
 
        Console.WriteLine("The first digit of entered number: "+ num);
 
        Console.ReadLine();
    }
}

Result:

Enter any number: 123456

The last digit of entered number: 6

The first digit of entered number: 1