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how to download a file with a save dialogue box using IHttpAsyncHandler

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :ASP.Net

I have an IHttpAsyncHandler I am trying to use and download a file. I want to click a button and call the handler to show the user a save dialogue box and have the user save the file locally. I have tried a few things but nothing works.  Does any one know how to get this to work if it can work. I will share some code I have but it doesn't seem to work it goest to the handler but it doesn't give the download handlerand it doesn't through an error.

  <script type="text/javascript">
        var httpReq = null;
        function callDLHandler(id, type) {
            httpReq = XMLHttpRequest();
            httpReq.open("GET", "DLAudioHandler.ashx?id=" + id + "&t=" + type, true);

        // initialize XMLHttpRequest object
        function XMLHttpRequest() {
            var xmlHttp;
            try {

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