using System;

using System.IO;

using System.Diagnostics;

using System.Text;

using System.Collections.Generic;                   

​

public class Program

{

    public static void Main()

    {

        var s = new String('x', 10000000);

​

        StringReaderTest(s);

        DataReaderTest(s);

    }

    private static void StringReaderTest(string s)

    {

        var stopwatch = new Stopwatch();

        stopwatch.Start();

        var reader = new StringReader(s);

        while (reader.Peek() > -1)

        {

            reader.Read();

        }

        stopwatch.Stop();

        Console.WriteLine(stopwatch.ElapsedMilliseconds);

    }

​

    private static void DataReaderTest(string s)

    {

        var stopwatch = new Stopwatch();

        stopwatch.Start();

​

        var reader = new DataReader(s);

​

        while (reader.Peek() > -1)

        {

            reader.Read();

        }

​

        stopwatch.Stop();

        Console.WriteLine(stopwatch.ElapsedMilliseconds);

    }

}

​

public class DataReader

{

    private String source;

    private int pos;

    private int length;

​

    public DataReader(string data)

    {

        source = data;

        length = source.Length;

    }

​

    public int Peek()

    {

        if (pos == length) return -1;

        return source[pos];

    }

​

    public int Read()

    {

        if (pos == length) return -1;

        return source[pos++];

    }

}