CreateTriangleMethod

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication7
{
    class Program
    {

        static void Main(string[] args)
        {
            Console.Write("Enter n=");
            int n = int.Parse(Console.ReadLine());
            for (int p = 1; p <= n ; p++)
            {
                PrintTriangle(1, p);
                Console.WriteLine();
            }
            for (int i = n - 1; i > 0; i--)
            {
                PrintTriangle(1, i);
                Console.WriteLine();
            }

        }
        static void PrintTriangle(int beginning, int lines)
        {
            for (int i = beginning; i <= lines; i++)
            {
                Console.Write(" {0}", i);

            }
        }
    }
}