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    <p>Instead of <code>select new</code> do <code>select p</code>. Currently you are selecting anonymous object and you can't convert it to <code>System.Linq.IQueryable CustomMethod.Order_Detail</code> </p> <p>You can't project to <code>Order_Detail</code> since it appears to be a class of framework. Since you are doing calculation in your anonymous object, You can either return <code>IQueryable&lt;Order_Detail&gt;</code> by <code>select p</code> and do the calculation later on LINQ to object, or you may create a new class and project to that. If you end up creating a new class then you should modify your signature as per class name. </p> <pre><code>public IQueryable&lt;Order_Detail&gt; getByYear(int year) { var dc = new NorthwindBigEntities(); var query = from p in dc.Order_Details where p.Order.OrderDate != null &amp;&amp; p.Order.OrderDate.Value.Year == year select p; return query; } </code></pre> <p>If you create a new class like:</p> <pre><code>public class MyClass { public string Product {get;set;} public double TotalSales {get;set;} } </code></pre> <p>Then you can do </p> <pre><code>public IQueryable&lt;MyClass&gt; getByYear(int year) { var dc = new NorthwindBigEntities(); var query = from p in dc.Order_Details where p.Order.OrderDate != null &amp;&amp; p.Order.OrderDate.Value.Year == year select new MyClass { TotalSales = p.UnitPrice * p.Quantity, Product = p.Product.ProductName }; return query; } </code></pre> <p>Considering <strong>its a service returning data, its better if you create your own class</strong> and return only the required properties. You should also see <a href="https://stackoverflow.com/questions/460831/linq-to-sql-return-from-function-as-iqueryablet">this question</a></p>
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    1. POhow to cast an anonymous type to IQueryable<Order_Detail> in C#?
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    1. USHabib
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    1. POhow to cast an anonymous type to IQueryable<Order_Detail> in C#?
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    1. COHello Habib, I have modified my code according to your suggestion but I am still geting same error.
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      1. USRudresh Bhatt
    2. CO@RudreshBhatt, What approach you are trying ? did you create new class ?
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    3. COI have created a new class as you suggested but I was not successed. only the error changed "can not implesitly cast IQueryable<MyClass> to Linq"
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      1. USRudresh Bhatt
 

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