c#操作文本文件

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

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