ASP. NET rename a file when it is downloaded

In some cases, to ensure that the file will not overwrite the previously uploaded files, and since there may be many files in the target directory, it is not a good idea to look them up one by one, so GUID can be generated automatically and the file name can be renamed to the original name of GUID_. However, it is probably best to ensure that the original name is restored when downloading. Listen to me this time. After searching 1 related data, we know that response can be used to solve the problem. The code is as follows.

[csharp]

<pre name="code" class="csharp">string path = Server.MapPath("aa\\ahaakladahsasdas_bb.zip");  
            string newfileName = "";  
            if (File.Exists(path))  
            {  
                FileInfo fi = new FileInfo(path);  
                Response.Clear();//Clear  Method deletes all of the buffers  HTML  The output. but  Clear  Method only deletes the response body   
                // Without deleting the response header. You can use this method to handle error cases.   
                Response.ClearHeaders();  
                Response.Buffer = false;// Indicates whether the output page is buffered when the property value is True When,   
                // The server will not send any information to the client until all the programs are executed or encountered    
                //Response.Flush or Response.End Statement will release the buffer information.   
                string filename = Path.GetFileName(path);  
                newfileName = newfileName + filename.Substring(filename.LastIndexOf("."));  
                Response.Clear();  
                Response.ClearHeaders();  
                Response.Buffer = false;  

                newfileName = HttpUtility.UrlEncode(newfileName);//  this 1 Step pop-up download saved dialog box, the filename appears disorderly, but the filename in the variable is normal.     
                Response.AppendHeader("Content-Disposition", "attachment;filename=" + newfileName);// Save the file for the user is the name of the display   
                // Tell the client the type of the response content is attachment  You are through Response.AppendHeader("content-type", "attachment");  The statement.   

                Response.AppendHeader("Content-Length", fi.Length.ToString());  
                Response.ContentType = "application/octet-stream";  
                Response.WriteFile(newfileName);// with response To return the path to the file     
                Response.Flush();// empty response    
                Response.End();  
                //Response.End();  Can be used if an exception is thrown   
                //HttpContext.Current.ApplicationInstance.CompleteRequest();  
            }  
            else  
            {  
                Response.Write("<script langauge=javascript>alert( 'The file does not exist !');</script>");  
            }

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