using System;

using System.Data;

using System.Reflection;

using System.Collections.Generic;

using System.Xml;

public class Program

{

    public static void Main()

    {

        var list = new List<MyObject>();

        list.Add(new MyObject() { Name = "Person 1" });

        list.Add(new MyObject() { Name = "Person 2" });

        list.Add(new MyObject() { Name = "Person 3" });

        var dt = ToDataTable(list);

        Console.WriteLine(dt.Rows.Count);

    }

    public static DataTable ToDataTable<T>(List<T> items)

    {

        DataTable dataTable = new DataTable(typeof(T).Name);

        PropertyInfo[] Props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

        foreach (PropertyInfo prop in Props)

        {

            var type = (prop.PropertyType.IsGenericType && prop.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>) ? Nullable.GetUnderlyingType(prop.PropertyType) : prop.PropertyType);

            dataTable.Columns.Add(prop.Name, type);

        }

        foreach (T item in items)

        {

            var values = new object[Props.Length];

            for (int i = 0; i < Props.Length; i++)

            {

                values[i] = Props[i].GetValue(item, null);

            }

            dataTable.Rows.Add(values);

        }

        return dataTable;

    }

    public class MyObject {

        public string Name { get; set; }

    }

}