using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static T CreateType<T>(List<T> list)where T : new ()

    {

        var obj = new T();

        var type = typeof (T);

        var properties = type.GetProperties();

        foreach (var prop in properties)

        {

            var value = list.Select(x => x.GetType().GetProperties().First(y => y == prop).GetValue(x) as string).OrderByDescending(x => x.Length).First();

            var propInstance = obj.GetType().GetProperties().First(x => x == prop);

            propInstance.SetValue(obj, value);

        }

​

        return obj;

    }

​

    public class SomeClass

    {

        public string Name

        {

            get;

            set;

        }

​

        public string Car

        {

            get;

            set;

        }

    }

​

    public static void Main()

    {

        var someList = new List<SomeClass>()

        {new SomeClass()

        {Name = "some value 1", Car = "Some value 2 longer"}, new SomeClass()

        {Name = "some value 1 longer", Car = "Some value 2"}};

        var mYtype = CreateType(someList);

        Console.WriteLine(mYtype.Name + ", " + mYtype.Car);

    }

}