I know it's a bit combersome, but it's my first attempt., C#

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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)
        {
        string[] names = new string[] {"Professor X", "Iceman", "Angel", "Beast", "Phoenix", "Cyclops", "Wolverine",                                     
                                                             "Nightcrawler", "Storm", "Colossus"};
        int[] numbers = new int[] { 7,9,12,15,17,13,2,6,8,13};
        string result = ""; // putting in ASP.NET web form
        string mostwins = "";
        string leastwins = "";
        int highest = 0;
        int lowest = 1000;
        int indexofhigh = 0;
        int indexoflow = 0;
        int temphigh = 1;
        int templow ;
   
for(int index = 0; index < numbers.Length; index++)
            {
      //Console.WriteLine("{0} with {1} wins ",names[index],numbers[index]);
    
    temphigh = numbers[index];
    templow = numbers[index];

if(numbers[index] > highest)
                {
                    
                highest = numbers[index];
               indexofhigh = index;
                mostwins = names[index];
                }
                 
    if(numbers[index] < lowest)
                {
                    
                lowest = numbers[index];
               indexoflow = index;
                leastwins = names[index];
                }

}

Console.WriteLine("{0} Battles won = {1}  ",mostwins,highest);
Console.WriteLine("{0} Battles won = {1}  ",leastwins,lowest);
     
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,11 sec, cpu time: 0,09 sec, average memory usage: 12 Mb, average nr of threads: 2, absolute service time: 0,29 sec