C# find highest array value and index, 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;
using System.Data;
using System.Data.SqlClient;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            int[] anArray = { 1, 5, 2, 7 };
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[2] { new DataColumn("index"), new DataColumn("val")});
            dt.Columns["index"].AutoIncrement = true;
            dt.Columns["index"].AutoIncrementSeed = 1;
            dt.Columns["index"].AutoIncrementStep = 1;
            foreach(int i in anArray)
                dt.Rows.Add(null, i);
            
            DataRow[] dr = dt.Select("[val] = MAX([val])");
            Console.WriteLine("Max Value = {0}, Index = {1}", dr[0][1], dr[0][0]);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,27 sec, cpu time: 0,27 sec, average memory usage: 23 Mb, average nr of threads: 4