What I describe here, you’d put in the Button_Click event and would cause a pop-up to appear on the client screen that gives the option to save, open or cancel. Bear in mind – there is no web code that allows you to just write to a client computer – that’s called a Trojan Horse (yeah, yeah -some people are stupid and let you do it, but you shouldn’t write you code to assume that).

But, this code should get you moving along the path I think you want to take.

Use the Response object, just like you’d do Response.Write.
However, instead do this:
BinaryStream myStream = SomeFunctionToGetStream
Response.BufferOutput = true
Response.ClearHeaders()
Response.ClearContent()
Response.Write(”content-disposition”,”inline;filename=MyFile.txt”);
Response.AddHeader(”content-length”, myStream.length)
Response.BinaryWrite(myStream);
Response.Flush

I’m probably missing a command or two since I’m doing this off my head – I don’t write this specific type of code much – instead I just wrap it up in a class. Anyhoo – seach on BinaryWrite and those other commands and you should be able to find a real example.

Edit: Then make the button redirect to the file instead of using a link. The easiest way would probably just be to use JavaScript… write a function that redirects to the file you want them to download, and have the button onClick event invoke the function.