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    <p>You stated: I have a list of strings (converted from Guid) ...</p> <p>Can you NOT convert them into strings and keep it as a List&lt; System.Guid>?? Then you can do this (assuming PendingIdGuidList is List&lt; System.Guid>:</p> <pre><code>var regionRequets = (from r in db.course_requests join p in PendingIdGuidList on u.request_state equals p select r).ToList(); </code></pre> <p>Edited to add:</p> <p>I ran a test on this using the following code:</p> <pre><code>var db = new EntityModels.MapleCreekEntities(); List&lt;System.Guid&gt; PendingIdGuidList = new List&lt;System.Guid&gt;() { System.Guid.Parse("77dfd79e-2d61-40b9-ac23-36eb53dc55bc"), System.Guid.Parse("cd409b96-de92-4fd7-8870-aa42eb5b8751") }; var regionRequets = (from r in db.Users join p in PendingIdGuidList on r.Test equals p select r).ToList(); </code></pre> <p>Users is a table in my database. I added a column called Test as a Uniqueidentifier data type, then modified 2 records with the following Guids.</p> <p>I know it's not exactly a 1:1 of what the OP is doing, but pretty close. Here is the profiled SQL statement:</p> <pre><code>SELECT [Extent1].[ID] AS [ID], [Extent1].[UserLogin] AS [UserLogin], [Extent1].[Password] AS [Password], [Extent1].[Test] AS [Test] FROM [dbo].[Users] AS [Extent1] INNER JOIN (SELECT cast('77dfd79e-2d61-40b9-ac23-36eb53dc55bc' as uniqueidentifier) AS [C1] FROM ( SELECT 1 AS X ) AS [SingleRowTable1] UNION ALL SELECT cast('cd409b96-de92-4fd7-8870-aa42eb5b8751' as uniqueidentifier) AS [C1] FROM ( SELECT 1 AS X ) AS [SingleRowTable2]) AS [UnionAll1] ON [Extent1].[Test] = [UnionAll1].[C1] </code></pre>
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    1. POLINQ query (or lambda expression) to return records that match a list
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    1. COAssuming db.course_requests is an IQueryable in the database and PendingIdGuidList is an in memory collection, you can't join them this way. The preferred solution is to use Contains in the Where clause rather than a join.
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      1. USJim Wooley
    2. COActually, it works just fine. I just ran a test and viewed it in my profiler. See my modified answer for what SQL Server did.
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