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Data access layer
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Data_access_object/x82qDLxx">Data access object</a></li> <li><a href="/facts/Database_abstraction_layer/3k8RwL1s">Database abstraction layer</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://msdn.microsoft.com/en-us/library/ee658127.aspx">Microsoft Application Architecture Guide</a></li> <li><a href="https://www.asp.net/web-forms/tutorials/data-access/introduction/creating-a-data-access-layer-cs">ASP.NET DAL tutorial</a></li></ul>