How to refresh images in every second in windows 7 phone - windows

Question

i am showing images from server. In server image is changing in every second. I want that in my application image should be change automatically after one second.M new in windows 7 programming. Kindly suggest me where i am lacking in concept. M using this code.
This process will start when i will tab on my image.
private void image1_Tap(object sender, GestureEventArgs e)
{
System.Windows.Threading.DispatcherTimer dt = new System.Windows.Threading.DispatcherTimer();
dt.Interval = new TimeSpan(0, 0, 0, 0, 1000); // 500 Milliseconds
dt.Tick += new EventHandler(dt_Tick);
dt.Start();
}
This is calling this method .
void dt_Tick(object sender, EventArgs e)
{
status.Text = "chking" + counter++;
// Do Stuff here.
image1.Source = null;
Uri imgUri = new Uri(base_url,UriKind.Absolute);
BitmapImage BI = new BitmapImage(imgUri);
int H = BI.PixelHeight;
int w = BI.PixelWidth;
image1.Source = BI;
}
In this code my Counter is working fine and status.Text is sucessfully change in every second. But image is changing once after that its not changing.
Kinldy suggest me where i am commiting mistake.
Thanks in advance
Gaurav Gupta

Answer 1

I think you should declare System.Windows.Threading.DispatcherTimer dt = new System.Windows.Threading.DispatcherTimer(); as a member variable instead of declaring it in the images tap event.

Answer 2

I do the same thing when grabbing images from a camera in my wp8 app. I hold the URL including the current datetime-value as a url-param in my viewmodel. When i want to refresh, i just reset my URL-property.
Here's my sample:
this.MyUrlProperty = string.Format("{0}?timestamp={1:yyyy-MM-dd HH:mm:ss:fff}", _originalCameraUrl, DateTime.Now);
Works great for me...