程序实现下载文件或者打开文件

FileInfo DownloadFile = new FileInfo("c:\\a.doc");  
// 下面到就是读取文件，通过数据流的方式下载了。  
Response.Clear();  
Response.ClearHeaders();  
Response.Buffer = false;  
Response.ContentType = "application/octet-stream";  
Response.AppendHeader("Content-Disposition", "inline;filename=" + HttpUtility.UrlEncode("c:\\a.doc", System.Text.Encoding.UTF8));  
Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());  
Response.WriteFile(DownloadFile.FullName);  
Response.Flush();  
Response.End();