The question you see now is not the question the OP posted at first. That is, a significant part was added after several minutes. Before, the question boiled down to:
I want to convert this is into a LINQ expression, I am a beginner to LINQ and EF, can someone guide me into writing this into LINQ?
It is not difficult to see how this might have been interpreted as one of the unpopular "Give me teh codez" type questions. And those tend to attract downvotes. And especially so when asked within a very active tag-community.
The second revision added
This is what I have so far:
var supervisors = (from employee in Employee
where employee.location_OID == "???" //I have ID's in a list here
While one might argue that this is not a big change in amount of content, it at the very least shows the OP is trying to resolve his own problems and not necessarily relies on us to do so. That is, he is no longer asking us to solve his problem, but asking us to help him solve his own problem. And that makes the question a whole lot better.
All in all I would say this is not about any perceived triviality of the problem, nor users shooting from the hip. A little bit of care on behalf of the OP when posting this question, taking a bit more time to make it a good one, would have most likely, at the very least somewhat reduced the amount of downvotes.