I want a program to print all combinations of given array

Hi sir,

 

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

class Program
{
static void Main(string[] args)
{
int[] Arr = { 1, 2, 3, 4, 5 };
var combo = from a in Arr
from b in Arr
from c in Arr
select string.Concat(a,b,c);
foreach (var v in combo)
{
Console.WriteLine(v);

}
Console.ReadKey();
}
}