1、建立一个文本文件

public class FileClass{    public static void Main()    {    WriteToFile();    }    static void WriteToFile()    {    StreamWriter SW;    SW=File.CreateText("c:\MyTextFile.txt");    SW.WriteLine("God is greatest of them all");    SW.WriteLine("This is second line");    SW.Close();    Console.WriteLine("File Created SucacessFully");    }}

2、读文件

public class FileClass{    public static void Main()    {    ReadFromFile("c:\MyTextFile.txt");    }    static void ReadFromFile(string filename)    {    StreamReader SR;    string S;    SR=File.OpenText(filename);    S=SR.ReadLine();    while(S!=null)    {    Console.WriteLine(S);    S=SR.ReadLine();    }    SR.Close();    }}

3、追加操作

public class FileClass{    public static void Main()    {    AppendToFile();    }    static void AppendToFile()    {    StreamWriter SW;    SW=File.AppendText("C:\MyTextFile.txt");    SW.WriteLine("This Line Is Appended");    SW.Close();    Console.WriteLine("Text Appended Successfully");    }}