Contact returns all the elements of the first sequence, followed by all the elements of the second.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main()
{
int[] seq1 = { 1, 2, 3 };
int[] seq2 = { 3, 4, 5 };
IEnumerable concat = seq1.Concat(seq2);
foreach(int i in concat){
Console.WriteLine(i);
}
}
}
The output:
1
2
3
3
4
5