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    <p>An <code>IRepository</code> is an interface you specify when you want to implement the Repository Pattern. As @Brian Ball stated, it's not part of .NET it is an interface that you create. </p> <p>Developers using the Repository Pattern widely recommend the use of an interface for the implementation. For example, in the application I am developing right now, I have 5 repositories. 4 specific and 1 generic. Each one inherits from an <code>IRepository</code> which ensures I will not have issues down the road with differences in implementations.</p> <p>As far as code examples, I'll try:</p> <pre><code>interface IRepository&lt;T&gt; where T : class { IQueryable&lt;T&gt; Select(); } </code></pre> <p>Implemented as a generic repository:</p> <pre><code>public class Repository&lt;T&gt; : IRepository&lt;T&gt; where T : class { public IQueryable&lt;T&gt; Select() { return this.ObjectContext.CreateObjectSet&lt;T&gt;(); } } </code></pre> <p>Implemented as a specialized repository:</p> <pre><code>public class EmployeeRepository : IRepository&lt;Employee&gt; { public IQueryable&lt;Employee&gt; Select() { return this.ObjectContext.Employees; } } </code></pre> <p>Both the <code>Repository&lt;T&gt;</code> and <code>EmployeeRepository</code> implement <code>IRepository</code>, however they go about performing the querying slightly differently. The generic repository has to create an object set of T before it can try to do anything.</p> <p>Keep in mind that <code>Repository&lt;T&gt;</code> is supposed to be locked to the interface, where as <code>EmployeeRepository</code> can implement more specialized methods to accomplish more complex logic.</p> <p>I hope this helps you a little.</p>
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    1. CO+1 good explanation/code. Only thing i'd add is my personal preference is to have the specialized repository inherit from the generic repository. E.g `public class EmployeeRepository : Repository<Employee>`. That way you don't have to recode the generic methods, e.g `IQueryable<Employee> Select()`, as it will be defined in the base repository.
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    2. CO+1 to you my friend, that is a very good advice. Why didn't I think of that earlier... :)
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