title: Release memory when closing window in WPF
body: <p>How can I release the memory used by some external resources (images in BitmapImage class) when I close the children window.</p>
  
  <p>In the Task Manager, my application (in WPF with .NET 3.5 in C#) is using ~800,000 KB when the children window is opened with all images loaded, but when I close it, the memory usage is the same, I think that the app doesn't dispose this resources, like the WinForms apps with Dispose(); Method.</p>