学步园

using System.IO;

//声明控件
protected System.Web.UI.HtmlControls.HtmlTextArea txtValue;

读取文本文件：

//主程序
FileStream   fsInfo = new  FileStream( "文件路径（在项目内的）", FileMode.Open, FileAccess.Read );
StreamReader  srInfo  =  new StreamReader( fsInfo, System.Text. Encoding.GetEncoding( "GB2312" ) );
srInfo.BaseStream.Seek( 0, SeekOrigin.Begin );
txtValue.Value  = " ";
string strLine  = srInfo.ReadInfo();
while( strLine != null )
{
             txtValue.Value  +=   strLine  + "/n";
             strLine   =   srInfo.ReadLine();
}
srInfo.Close();

写入文本文件：

//主程序
FileStream fsInfo  = new FileStream( 文件路径（在项目内的）", FileMode.OpenOrCreate, FileAccess.Write );
StreamWriter swInfo = new StreamWriter( fsInfo );
swInfo.Flush();
swInfo.BaseStream.Seek( 0, SeekOrigin.Begin );
swInfo.Write( txtValue.Value );

swInfo.Flush();
swInfo.Close();