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And read Martin Fowler and Robert Martin..<br />
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Especially <a href="https://en.wikipedia.org/wiki/SOLID_(object-oriented_design)" rel="ugc">the SOLID principles</a>.. they show the architectural aspects.
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And read Martin Fowler and Robert Martin..

Especially the SOLID principles [https://en.wikipedia.org/wiki/SOLID_(object-oriented_design)].. they show the architectural aspects.

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I came across phrase &quot;It's always better to program against interface than concrete types&quot;. <br />
<br />
can someone elaborate on this a little, with some examples.
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I came across phrase "It's always better to program against interface than concrete types". 

can someone elaborate on this a little, with some examples.

interfaces

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).