C#入门代码

     最近很忙,忙着学习,忙着出报纸,忙着写总结,忙着计划,忙着考试……
    没有写一些学习.NET的心得了，过一些天吧，今天看到一篇文章很不错，特地转载了一下

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' )
        {
             //-------------
        }
    }
    public static void DisplayTimeEvent( object source, ElapsedEventArgs e )
    {
        Console.Write(\r{0}, DateTime.Now);
    }
}
七、调用外部程序：
class Test
{
    static void Main(string[] args)
    {
        System.Diagnostics.Process.Start(notepad.exe);
    }
}

ADO.NET方面的：
八、连接Access数据库：
using System;
using System.Data;
using System.Data.OleDb;

class TestADO
{
    static void Main(string[] args)
    {
        string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\test.mdb;
        string strSQL = SELECT * FROM employees ;

        OleDbConnection conn = new OleDbConnection(strDSN);