How to download file with asp.net on buttton's onClick event?

Question

I have a String variable (in C#) that contain the full path of PDF file on my server (like that \"~/doc/help.pdf\").

I want that in click on button, this file will down

Answer 1

With an ASP button:

button.OnClientClick = string.Format("javascript:window.location='{0}'", pdfLink);

The logic behind this is here: Client-side click

This will not reload the page and do a post-back, it will just navigate to the PDF which will be displayed in the browser.

---

Set the button's onclick event to this scriptlet:

onclick="javascript:window.location='/doc/help.pdf'"

To create that server-side:

Where PDFLink is a string property in the code behind:

public string PDFLink
{
    get
    {
        return "/doc/link.pdf";
    }
}

From here it should be trivial to take the string from the database and render it absolute if need be.