Pick either the forums or QA - but don't post in both. Posting exactly the same thing in multiple places justs wastes our time and duplicates work - particularly when the question is too vague to answer in the first place! Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

You have several options: Use the Response.TransmitFile method[^]; Use the Response.WriteFile method[^]; Read the file one block at a time and write each block to the response before reading the next block; TransmitFile is the preferred method: string physicalPath = ListBox1.SelectedValue; if (!string.IsNullOrWhiteSpace(physicalPath)) { FileInfo fileToSend = new FileInfo(fileToSend); if (fileToSend.Exists) { System.Web.HttpContext context = System.Web.HttpContext.Current; context.Response.Clear(); context.Response.ClearHeaders(); context.Response.ClearContent(); context.Response.ContentType = "application/octet-stream"; context.Response.AddHeader("content-length", fileToSend.Length.ToString()); context.Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlPathEncode(fileToSend.Name)); context.Response.TransmitFile(fileToSend.FullName); context.Response.Flush(); context.ApplicationInstance.CompleteRequest(); } } WriteFile will work in the same way, but can have problems with large files[^]. Reading the file in small blocks requires more code, and won't perform as well as TransmitFile: // (Same code as before, up to and including the "Content-Disposition" header) int bytesRead; byte[] buffer = new byte[10000]; using (Stream fileStream = fileToSend.OpenRead()) { while (context.Response.IsClientConnected && (bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { context.Response.OutputStream.Write(buffer, 0, bytesRead); context.Response.Flush(); } } context.ApplicationInstance.CompleteRequest();

Thank You soo much for your kind explanation.. I got the answer..

Only the language being used is C#, the framework that you are using is ASP.NET Web Forms. So, consider looking for an answer in ASP.NET Web Forms framework, not C#. In C# there are many ways to show a dialog, // .NET new MessageBox("Hello").Show(); // Windows Runtime new MessageDialog("Hello").ShowAsync(); // etc The one you are looking for is ASP.NET based, which is for sure, alert('hello'). The thing is that you are sending the alert box to the client, do not do this. Alerts must be shown once the page has been loaded, in case if there is an error. Do not show a popup as soon as the page loads. Try this: 1. Send an ajax request to the web page, to find the files. 2. Send a response, if that response fails - Show the alert box. This way you will implement what you want, it would allow you to use plain-JavaScript to do this. The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

I believe for security reasons you cannot do this otherwise what's to stop someone pushing a file to a client silently to the client's system folders? Ergo the client takes over handling where to save it to instead.

Thank You. its really work..

ok. thank you

Thank you so much for your help. I got the answer. I did not declare file, that's why it shows error. now I'm done.

Thank you for your kind info. This is my company requirement to do so. I will discuss about it with the authority person. Thank You

Thank you for your sharing..