/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// uploadprogresschangedeventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this UploadProgressChangedEventHandler uploadprogresschangedeventhandler, Object sender, UploadProgressChangedEventArgs e, AsyncCallback callback)
{
if (uploadprogresschangedeventhandler == null)
{
throw new ArgumentNullException("uploadprogresschangedeventhandler");
}
return(uploadprogresschangedeventhandler.BeginInvoke(sender, e, callback, null));
}
