04.MethodsLab-Printing Triangle

4. Printing Triangle
Create a method for printing triangles as shown below:
Examples
Input   Output
3       1
        1 2
        1 2 3
        1 2
        1
4       1
        1 2
        1 2 3
        1 2 3 4
        1 2 3
        1 2
        1

using System;

namespace _04MethodsLabPrintingTriangle
{
    class Program
    {
        static void Main(string[] args)
        {
            int input = int.Parse(Console.ReadLine());
            TopTriangle(input);
            BottomTriangle(input - 1);
            /*
             for (int i = 1; i <= input; i++)
                 PrintLine(1, i); // Print 1... 1 2 ... 1 2 3 n

             for (int a = input - 1; a >= 1; a--)
                 PrintLine(1, a); // Print 1 2 3 n ... 1 2 ... 1*/
        }

        /*private static void PrintLine(int start, int end)
          {
              for (int i = start; i <= end; i++)
              {
                  Console.Write(i + " ");
              }
              Console.WriteLine();
          }*/
        private static void TopTriangle(int input)
        {
            for (int i = 1; i <= input; i++)
            {
                for (int a = 1; a <= i; a++)
                {
                    Console.Write(a + " ");
                }
                Console.WriteLine();
            }
        }
        private static void BottomTriangle(int input)
        {
            for (int i = input; i > 0; i--)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write(j + " ");
                }
                Console.WriteLine();
            }
        }
    }
}