using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    struct Amounts

    {

        public string Name;

        public int Total;

    }

​

    public static void Main()

    {

        var amounts = new List<Amounts>{

            new Amounts{Name = "Name1", Total = 31},

            new Amounts{Name = "Name2", Total = 35},

            new Amounts{Name = "Name3", Total = 32},

            new Amounts{Name = "Name4", Total = 35}

        };

        var results = amounts.MaxsBy(x => x.Total);

        Console.WriteLine(string.Join("\n", results.Select(x => x.Name)));

    }

}

​

public static class Extensions 

{

    public static IEnumerable<TSource> MaxsBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource,TKey> keySelector)

    {

        return source.GroupBy(keySelector).MaxBy(g => g.Key);

    }

}