cannot find the ETW classes TraceProvider, ComponentTraceProvider classes in Microsoft.BizTalk.Tracing.dll.

Hi,

I am trying to implement ETW tracing in my BizTalk solutions and I am pretty new to ETW. I read the post ( http://blogs.msdn.com/b/appfabriccat/archive/2010/05/11/best-practices-for-instrumenting-high-performance-biztalk-solutions.aspx ) and I found the Microsoft.BizTalk.Tracing.dll in GAC and added its reference.

However in the namespace Microsoft.BizTalk.Diagnostics, I am not able to find the classes TraceProvider and ComponentTraceProvider. Am I missing anything here ?  Is there anything else I need to do here ?

Are there any other assemblies I need to install ? Should I install windows SDK (I am not sure as I already have the Microsoft.BizTalk.Tracing.dll )?

THANKS IN ADVANCe 

PLEASE HELP

Surya