use Concat with array elements
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int[] moreNumbers = { 10, 11, 12, 13 };
var query = numbers.Concat(moreNumbers);
}
}
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