setting content disposition

[davebat]

I have set up a page with a link to a file to download, that will prompt user to open, save or cancel rather than open the xls in browser like this:

Dim VirtualPath As String = Request.ServerVariables("SERVER_NAME").ToString
Dim file As String = Request.QueryString("href")
Dim filepath As String = "http://" & VirtualPath & file
Dim filename As String = System.IO.Path.GetFileName(filepath)
Response.ContentType = "application/x-msdownload"
 
lblHref.Text = ("<a href=" & filename & ">download</a>")

is there a way to open the save as box straight away without clicking save?