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C#写入记事本（txt）文件
方法一：
FileStream stream = new FileStream(@"d:aa.txt",FileMode.Create);//fileMode指定是读取还是写入
StreamWriter writer = new StreamWriter(stream);
writer.WriteLine("123456");//写入一行，写完后会自动换行
writer.Write("abc");//写完后不会换行
writer.WriteLine("ABC");
writer.Close();//释放内存
stream.Close();//释放内存
 
方法二：
StreamWriter writer = new StreamWriter("d:\aa.txt");
writer.WriteLine("123456");
writer.Write("abc");
writer.WriteLine("ABC");
writer.Close();
 
C#读取记事本文件
方法一：
FileStream stream = new FileStream(@"d:aa.txt", FileMode.Open);
StreamReader reader = new StreamReader(stream);
//this.textbox1.Text = reader.ReadLine(); //一次性读取一行
this.textbox1.Text = reader.ReadToEnd();  //一次性读取全部数据
reader.Close();
stream.Close();
 
方法二：
StreamReader reader = new StreamReader(@"d:\aa.txt");
this.textbox1.Text = reader.ReadToEnd();
reader.Close();