一般的小东西：
一、从控制台读取东西代码片断：
using System;

class TestReadConsole
{
    public static void Main()
    {
        Console.Write("Enter your name:");
        string strName = Console.ReadLine();
        Console.WriteLine(" Hi "+ strName);
    }
}
二、读文件代码片断：
using System;
using System.IO;

public class TestReadFile
{
    public static void Main(String[] args)
    {
        // Read text file C:\temp\test.txt
        FileStream fs = new FileStream(@"c:\temp\test.txt" , FileMode.Open, FileAccess.Read);
        StreamReader sr = new StreamReader(fs); 
       
        String line=sr.ReadLine();
        while (line!=null)
        {
            Console.WriteLine(line);
            line=sr.ReadLine();
        }  
       
        sr.Close();
        fs.Close();
    }
}
三、写文件代码：
using System;
using System.IO;

public class TestWriteFile
{
    public static void Main(String[] args)
    {
        // Create a text file C:\temp\test.txt
        FileStream fs = new FileStream(@"c:\temp\test.txt" , FileMode.OpenOrCreate, FileAccess.Write);
        StreamWriter sw = new StreamWriter(fs);
        // Write to the file using StreamWriter class
        sw.BaseStream.Seek(0, SeekOrigin.End);
        sw.WriteLine(" First Line ");
        sw.WriteLine(" Second Line");
        sw.Flush();
    }
}
四、拷贝文件：
using System;
using System.IO;

class TestCopyFile
{
    public static void Main()
    {
        File.Copy("c:\\temp\\source.txt", "C:\\temp\\dest.txt" ); 
    }
}
五、移动文件：
using System;
using System.IO;

class TestMoveFile
{
    public static void Main()
    {
        File.Move("c:\\temp\\abc.txt", "C:\\temp\\def.txt" ); 
    }
}
六、使用计时器：
using System;
using System.Timers;

class TestTimer
{
    public static void Main()
    {
        Timer timer = new Timer();
        timer.Elapsed += new ElapsedEventHandler( DisplayTimeEvent );
        timer.Interval = 1000;
        timer.Start();
        timer.Enabled = true;

        while ( Console.Read() != 'q' )