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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
           //Your code goes here
            Console.WriteLine("Hello, world!");
            
            int[] arr = {5, 4, 10, 7, 8, 1};
            
            for(int j = 0; j< arr.Length ; j++)
            {
                int minIndex = j;
                int minValue = arr[minIndex];
            
                for(int i = j+1; i< arr.Length ; i++)
                {
                    if(arr[i] < minValue)
                    {
                        minIndex = i;
                        minValue = arr[i];
                    }
                }
                
                if(minIndex != j)
                {
                    int temp = arr[j];
                    arr[j] = arr[minIndex];
                    arr[minIndex] = temp;
                }
            }
            
            foreach(int a in arr)
                Console.WriteLine(a);
            
            //Console.WriteLine("minvalue " + minValue);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,08 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3