how to downlaod file from url

Protected Sub btnCopy_Click(sender As Object, e As EventArgs)
    Try
        
            Dim filename As String = "abcd.mp3"
            Dim sourcePath As String = "\\is-pc634\Shared\"
 

 
        '--------Download Option-----------
            Dim response As System.Web.HttpResponse = System.Web.HttpContext.Current.Response
            response.ClearContent()
            response.Clear()
            response.ContentType = "audio/x-wav"
            response.AddHeader("Content-Disposition", "attachment; filename=" & fileName & ";")
            response.TransmitFile(sourcePath)
            response.Flush()
 
            response.End()
        Else
            msgBox("File cannot be downloaded.")
        End If
    Catch ex As Exception
        msgBox(ex.Message)
    End Try
 
End Sub