Detect in memory record link to table

Hello,
I recently was given an old project that now runs on .NET v3.5 with LINQ to SQL. I found that in the business logic layer, the previous authors frequently attempt to join in-memory "array of class" to SQL table directly, result in extremely slow
query as some of our customers has grow the database big with 10+ years of data.
I'm able to either push the entire logic to pure table join or pure in-memory join to workaround this, but want to know that is there any tools available that can help me check the whole project and pick these "array of class" to SQL table
queries out to fix.
Thank you.

Hello,
Personally, I do know there would be such a tool could be so smart to check if the query is a in memory join one. If these queries are similar with below one:
var result = (from od in ods
join o in db.Orders on od.OrderID equals o.OrderID
where od.OrderDetailID == 1
select o).ToList();
My idea is to search the whole project by the key word “from” and check these queries if there are local array object. If the project is huge, this might take some time. And if you find such a tool, it is suggested that you could share it to this forum which
would be helpful to others.
Regards.
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