The following section will outline the steps involved in clearing the cache for IE 9 browser.

1. Once your browser is open, click the gear at the top right to open the settings menu. Then, select Safety and Delete Browsing History… Or, optionally you may simply press Ctrl+Shift+Delete to open the Delete Browsing History window.
2. Select Temporary Internet Files. You will also need to uncheck all the other boxes, especially Preserve Favorites website data. This option makes the window also delete objects from websites in your Favorite folder, which is necessary to completely clear your cache.
3. Click the Delete button near the bottom of the window to perform the operations (i.e. clear your cache by deleting temporary files).
4. Your computer will work for a moment, and the process will be complete. You’ve successfully cleared Internet Explorer 9’s cache.

If the steps don’t work, please try to check your Silverlight project by open it in another computer. Hope this helps.