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    <p>Maybe an example will help here...</p> <p>Let's say you have a nicely-normalized database schema like this:</p> <pre> Orders (OrderID, CustomerID, OrderDate) Customers (CustomerID, Name) OrderDetails (OrderDetID, OrderID, ProductID, Qty) Products (ProductID, ProductName, UnitPrice) </pre> <p>And let's say you're using a nice O/R mapper that hands you back a well-organized domain model:</p> <pre> OrderDetail +--ID +--Order |--+--Date |--+--Customer |-----+--ID |-----+--Name +--Product |--+--ID |--+--Name |--+--UnitPrice +--Qty </pre> <p>Now you're given a requirement to display everything that's been ordered in the last month. You want to bind this to a flat grid, so you dutifully write a flat class to bind:</p> <pre><code>public class OrderDetailDto { public int ID { get; set; } public DateTime OrderDate { get; set; } public int OrderCustomerID { get; set; } public string OrderCustomerName { get; set; } public int ProductID { get; set; } public string ProductName { get; set; } public Decimal ProductUnitPrice { get; set; } public int Qty { get; set; } public Decimal TotalPrice { get { return ProductUnitPrice * Qty; } } } </code></pre> <p>That was pretty painless so far, but what now? How do we turn a bunch of <code>OrderDetail</code>s into a bunch of <code>OrderDetailDto</code>s for data binding?</p> <p>You might put a constructor on <code>OrderDto</code> that takes an <code>OrderDetail</code>, and write a big mess of mapping code. Or you might have a static conversion class somewhere. Or, you could use AutoMapper, and write this instead:</p> <pre><code>Mapper.CreateMap&lt;OrderDetail, OrderDetailDto&gt;(); OrderDetailDto[] items = Mapper.Map&lt;OrderDetail[], OrderDetailDto[]&gt;(orderDetails); GridView1.DataSource = items; </code></pre> <p>There. We've just taken what would otherwise have been a disgusting mess of pointless mapping code and reduced it into three lines (really just two for the actual mapping).</p> <p>Does that help explain the purpose?</p>
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    1. POWhat's Automapper for?
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    1. CONearly everything. If u add more about the power of Automapper, I am sure people will upvote...
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