Re: How can I resolve the Party Name

You are getting the access violation on the Searcher.Get(), which is calling the WMI interrface to retrieve the data you need.

WMI has it own Access Control List, that is managed via Computer Management console

Open Computer Management
Open Services and Applications
Right click WMI Control -> Properties

Select Security tab
Expand root and select MicrosoftBiztalkServer
Click Security button

Add the user or group that runs the pipeline (??BizTalk Host Users and Biztalk Isolated Host Users) and give full permissions