Permissions errors after adding dll to gac and changing to full trust

I am a novice to programming in general, but I am adding a dll to my application that allows us to access our database (raiser's edge), I was getting permissions error when trying to debug, I created a strong name for the dll and added it to the gac, then added the dll to my references and I still got the same error, so I went in a changed the trust level of the dll to full trust. I went into my application and tried again. Still getting the same error. I tried refreshing the Assemblies Cache and restarting my machine thinking that maybe the settings did apply yet. I still keep getting the same error.

Does anyone have any idea what I did wrong?