Today I was working on a Silverlight 4 side application and for some odd reason my breakpoints were not being hit when I was debugging.  I took what I thought were the right steps to resolve the issue.  I …

• Killed the development web service
• Killed and restarted Firefox (3.6.4)
• Killed and restarted VS 2010

Sadly none of these options worked……hum

Next I hit up google for an answer.  My blogger in crime Chris Bennage has a similar post here that I read through, and tried.  However, this did not resolve my issue.  However when reading through the comments someone said something that sparked a thought.  That was to attach the debugger to the browser.  So I tried this, however that also did not work, but I was on the right track.

In order for ME (and please note you may have a different end result than I did here) was to do the following.

1. Start the project without debugging so it would open up in the browser
2. Open up the Attach to Process dialog in VS
   
3. Change the ‘Attach to’ options and explicitly check Silverlight (this option may not be needed, but hey it worked)
   
4. Scroll down in the Process dialog until you find something that has the type set to ‘Silverlight’, If it says 'plugin-container.exe’ then you are on the right one (this is what the silverlight plugin runs in when running Firefox).
   
5. Click Attach
6. Debug away

Now again, this worked for me, this may NOT work for you.  Also, there may be a better way to do this, but this works until I can find the root cause.

Till next time,