Generate Database Backup (.bak) file and download in ASP.Net using C# and VB.Net

i still got "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack." but i found that it was because of update panel in download button.

Thanks a lot !!!

so here's the working code :D

protected void btnDownload_Click(object sender, EventArgs e)
{
    try
    {
        string dbNAme = dbName;
        string backupDestination = Server.MapPath("~/BackUp");
        string dateStamp = DateTime.Now.ToString("yyyy-MM-dd@HH_mm");
        string fileName = dbName + " of " + dateStamp + ".Bak";
 
        if (!Directory.Exists(backupDestination))
        {
            Directory.CreateDirectory(backupDestination);
        }
 
        DataTable dt = blu.queryFunction("BACKUP database " + dbNAme + " to disk='" + backupDestination + "\\" + fileName + "'");
 
 
        byte[] bytes = File.ReadAllBytes(Path.Combine(backupDestination, fileName));
        // Delete .bak file from server folder.
        if (Directory.Exists(backupDestination))
        {
            Directory.Delete(backupDestination, true);
        }
        Response.Clear();
        Response.Buffer = false;
        Response.Charset = "";
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.ContentType = "application/octet-stream";
        Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }
    catch(Exception ex)
    {
        string exception = ex.ToString();
    }           
}