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    <p>If one of the various duplicate answers doesn't help, <a href="http://geekswithblogs.net/EltonStoneman/archive/2010/07/11/where-in-style-queries-in-linq-to-entities.aspx" rel="nofollow">here is a link</a> to one that might. It references an extension to Linq-to-entities:</p> <pre><code>public static class QueryExtensions { public static IQueryable&lt;TEntity&gt; WhereIn&lt;TEntity, TValue&gt; ( this ObjectQuery&lt;TEntity&gt; query, Expression&lt;Func&lt;TEntity, TValue&gt;&gt; selector, IEnumerable&lt;TValue&gt; collection ) { ParameterExpression p = selector.Parameters.Single(); //if there are no elements to the WHERE clause, //we want no matches: if (!collection.Any()) return query.Where(x=&gt;false); if (collection.Count() &gt; 3000) //could move this value to config throw new ArgumentException("Collection too large - execution will cause stack overflow", "collection"); IEnumerable&lt;Expression&gt; equals = collection.Select(value =&gt; (Expression)Expression.Equal(selector.Body, Expression.Constant(value, typeof(TValue)))); Expression body = equals.Aggregate((accumulate, equal) =&gt; Expression.Or(accumulate, equal)); return query.Where(Expression.Lambda&lt;Func&lt;TEntity, bool&gt;&gt;(body, p)); } } </code></pre> <p>There are several others like it available.</p> <p><strong>EDIT</strong></p> <p>I've provided context for the code above, and here is possible usage:</p> <pre><code>db.SA_Opleiding.WhereIn(v =&gt; v.SomeCollection); </code></pre> <p>I haven't ever used this specific extension method, but they're all basically based on the same principle.</p>
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    1. COThanks for your answer, but where am I supposed to put this code then?
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    2. COAssuming you're using .NET 3.5 (I believe), in a static class accessible from the code you plan to execute. For more information, please reference [Extension Methods (C# Programming Guide)](http://msdn.microsoft.com/en-us/library/bb383977.aspx).
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    3. CO@Mortana - I've updated my answer to include semi-valid context.
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