//读取文件输出它  
 
string strFile = "c://abc.doc";  
 
FileStream fs = new FileStream(strFile, FileMode.Open);  
 
byte[] bytes = new byte[(int)fs.Length];  
 
fs.Read(bytes, 0, bytes.Length);  
 
fs.Close();  
 
Response.ContentType = "application/octet-stream";  
 
Response.AddHeader("Content-Disposition",  "attachment;  filename="  +  HttpUtility.UrlEncode(File.Name));  
 
Response.BinaryWrite(bytes);  
 
Response.End();