C# Coding help

This is something C# only coders don't easily understand.

To achieve what you want, replace

// Can NOT access because type being BaseClass
bc2.ExtraDetails = "Extended testing";

by this

// CAN access despite type being BaseClass - if it is an instance of ChildClass
ChildClass cc = bc2 as ChildClass;
if (cc != null)
    cc.ExtraDetails = "Extended testing";

I'm assuming the BaseClass is not under your control, otherwise the code could be (and should be) easier.

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