Silverlight xap caching?

You can turn the Enable Content Expiration HTTP header option on for your XAP file. Open IIS Manager, goto Default Web Site and find your Web site for the silverlight project. Find the XAP file under ClientBin. Goto the properties page of the XAP file, on HTTP Headers Tab, Turn on "Enable Content Expiration", click the "Expire Immediately" radio button. Save the change.

This way the new XAP (only there is a new XAP) will get downloaded when you refresh your page without having to close the browser.