This content originally appeared on Modern Web Development with Chrome and was authored by Paul Kinlan

<p>A couple of people have come to my site with the query "c# instanceof". I know how I get found for this. I copied an "instanceof" javascript method and talked about it in one of my entries.<p />The only relation to c# that I can think of would be the "is" and "as" keywords.<p />"is" can be used to test what type of object an object reference is. For instance [no pun intend, or thought of I think :)] a developer could write:if(m_car is MiniCooper){...<p />they would be saying that if the m_car variable is of the type MiniCooper then do something.<p />The "as" keyword is used to "cast" a type to another type. So you could write<p>if(m_car is MiniCooper){MiniCooper mc = m_car as MiniCooper;</p><p>The "as" keyword is slightly differnt to the Explicit cast (MiniCooper mc = (MiniCooper) m_car; because if the cast dosn't work with an "as" then the mc local variable will be null, rather than throwing an "InvalidCastException".</p><p>I hope this helps.</p><p /></p>

This content originally appeared on Modern Web Development with Chrome and was authored by Paul Kinlan