using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public static class Util

{

    public static DataTable ToDataTable(this List<string> iList, string columnName)

    {

        DataTable dataTable = new DataTable();

        dataTable.Columns.Add(columnName, typeof(string));

        iList.ForEach(e => dataTable.Rows.Add(e));

        return dataTable;

    }

​

    public static DataTable ToDataTable<T>(this List<T> iList)

    {

        DataTable dataTable = new DataTable();

        PropertyDescriptorCollection propertyDescriptorCollection = TypeDescriptor.GetProperties(typeof(T));

        for (int i = 0; i < propertyDescriptorCollection.Count; i++)

        {

            PropertyDescriptor propertyDescriptor = propertyDescriptorCollection[i];

            Type type = propertyDescriptor.PropertyType;

            if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))

                type = Nullable.GetUnderlyingType(type);

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

        }

​

        object[] values = new object[propertyDescriptorCollection.Count];

        foreach (T iListItem in iList)

        {

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

            {

                values[i] = propertyDescriptorCollection[i].GetValue(iListItem);

            }

​

            dataTable.Rows.Add(values);

        }

​

        return dataTable;

    }

}