Slow down label update

Question

Hi guys,
Right now I have an updater that is displaying it's download speed in client_ProgressChanged from a DownloadFileAsync.
txtDown.Text = "Downloading (" & Int32.Parse(Math.Truncate(percentage).ToString()) & "%)... (" & filesize & " MB) at " & (e.BytesReceived / SW.ElapsedMilliseconds).ToString + " /sec"
The problem is that the download speed is being updated very fast, and I just want to update it at the speed like IE does when downloading a file.
Any suggestions?

Answer 1

Here's a more complete example inferred from the code snippet you provided.  Note the changes to your code in order to provide what appear to be the intended results (convert bytes to megabytes, calculate rate with seconds instead of milliseconds). 
The implementation of the "lastUpdate" variable demonstrates the suggestion from my previous post.
Public Class Form1
Private WithEvents client As New System.Net.WebClient
Private sw As New Stopwatch
Private lastUpdate As Date
Private Async Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
sw.Restart()
Await client.DownloadFileTaskAsync("https://code.msdn.microsoft.com/Simple-Multi-User-TCPIP-1ff0da41/file/135320/5/Simple%20Multi-User%20TCPIP%20Client%20%26%20Server%20using%20TAP.zip", "d:\test\project.zip")
sw.Stop()
End Sub
Private Sub client_DownloadProgressChanged(sender As Object, e As Net.DownloadProgressChangedEventArgs) Handles client.DownloadProgressChanged
If Now.Subtract(lastUpdate).TotalMilliseconds >= 250 OrElse e.ProgressPercentage = 100 Then 'throttle to 4 updates per second
txtDown.Text = "Downloading (" & e.ProgressPercentage.ToString & "%)... (" & (e.TotalBytesToReceive / 1000000).ToString("N2") & " MB) at " & (e.BytesReceived / sw.Elapsed.TotalSeconds).ToString("N2") + " bytes/sec"
lastUpdate = Now
End If
End Sub
End Class
-EDITS-
Sorry, first I miscalculated the download rate, then I cleaned up the progress percentage, and finally I added a check to make sure that the text still displays the final update even if the throttle time hasn't been hit yet.
Reed Kimble - "When you do things right, people won't be sure you've done anything at all"