AD Query - Multiple Criteria

I am trying to query the department AD attribute but want to query for multiple filters - such as

department=TEST1 or department=TEST2

How would I do this>
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I suppose you use a DirectorySearcher object. The Filter property for this is build with operator preceding the operands. For example:

System.DirectoryServices.DirectorySearcher ds = new System.DirectoryServices.DirectorySearcher("");
ds.Filter = "(|(department=1)(department=2))"; // means department = 1 OR department = 2
ds.Filter = "(&(objectCategory=computer)(|(department=11)(department=12)(department=13)))";

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tbaseflugAuthor Commented:
OK - this works:

deSearch.Filter = "(&(objectClass=user)(objectCategory=person)(department=APDSLN))";

But for soem reason, this does not - when I include the extra department criteria, nothing is returned - when I do one or the other, it works individually, etc. (above):

deSearch.Filter = "(&(objectClass=user)(objectCategory=person)(department=APDSLN)(department=APDSLI))";

You use only one '&' operator, and this condition
   objectClass=user AND objectCategory=person AND department=APDSLN AND department=APDSLI
 cannot be true.

 You need to use '|' (meaning OR) operator also, this way:
deSearch.Filter = "(&(objectClass=user)(objectCategory=person)(|(department=APDSLN)(department=APDSLI)))";
   which you can translate:
    (objectClass=user) AND (objectCategory=person) AND (department=APDSLN OR department=APDSLI).

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