asp.net 超链接 下载TEXT文件，而不是直接在IE中打开

问题描述：后台生成了文本文件，用超链接提供给用户下载。点击超链接，下载Excel文件没问题，但文本文件会直接被打开，而不是弹出下载窗口。

解决方法：把HyperLink改为LinkButton，在Click事件中，用文件流写文本文件。

关键代码：

 protected void Button1_Click(object sender, EventArgs e)
 {
     string sFileName = System.IO.Path.GetRandomFileName();
     string sGenName = "Friendly.txt";

     //YOu could omit these lines here as you may
     //not want to save the textfile to the server
     //I have just left them here to demonstrate that you could create the text file
     using (System.IO.StreamWriter SW = new System.IO.StreamWriter(
            Server.MapPath("TextFiles/" + sFileName + ".txt")))
     {
         SW.WriteLine(txtText.Text);
         SW.Close();
     }

     System.IO.FileStream fs = null;
     fs = System.IO.File.Open(Server.MapPath("TextFiles/" +
              sFileName + ".txt"), System.IO.FileMode.Open);
     byte[] btFile = new byte[fs.Length];
     fs.Read(btFile, , Convert.ToInt32(fs.Length));
     fs.Close();
     Response.AddHeader("Content-disposition", "attachment; filename=" +
                        sGenName);
     Response.ContentType = "application/octet-stream";
     Response.BinaryWrite(btFile);
     Response.End();
 }

参考文档：http://www.codeproject.com/useritems/textfile.asp