can't invoke some methods of COM interop object

See more:

C#

COM

Silverlight

C#4.0

interop

Hi Everyone,

I'm trying to connect a specific device to my application in Silverlight environment, the provided dll is not usable in Silverlight so I tried using it as a COM object an late binding...

everything is fine, object is created in run-time and almost all methods are doing well after calling them, but there exist some methods which can not be invoked and throw exceptions of MissingMemberException and it says that the member not found! I used reflector for going through the dll and made sure that the member exist exactly with the same syntax i'm using, but still can't call that method,
please give any suggestion which lead me to find what is going on there!

thanks in advance for your replys....