Question

I have, in a WebForm (on .NET 3.5) a byte[], which “represent” a PDF file.

Well, I’d like to send it to the client, during a request (postback) from this page.

How can I do it? Tried searching, but I find only tutorial of byte[] from client to server.

Answer 1

You can do it this way, but you might have to clear the Response first to remove all the other page controls etc.

protected void Page_Load(object sender, EventArgs e)
{
    var byteArray = File.ReadAllBytes("test.pdf");

    Response.ContentType = "application/pdf";
    Response.AddHeader("content-disposition", "attachment;filename=test.pdf");
    Response.BinaryWrite(byteArray);
    Response.Flush();

    Response.End();
}

I usually create an IHttpHandler or WCF REST service to serve up files though.