C# - need to query based on objectGUID ?

How can I search AD if im given a objectGUID string ? Im first doing a
search using DirectorySearcher with a "SAMAccountname=" value, which returns
correctly. Then I get the directory entry and the objectguid. I need to
pass this value to another part of my application, and then verify its
existence in AD by querying the directory with it as a search filter. What
is the filter I use to do this with ?


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