class BaseClass { public void Method1(){} } class DerivedClass : BaseClass { public void Method2(){} } class Program { static void Main() { BaseClass bc = new BaseClass(); DerivedClass dc = new DerivedClass(); BaseClass bcd = new DerivedClass(); DerivedClass dcb = new BaseClass(); /*compile time error. Cannot implicitly convert type 'BaseClass' to 'DerivedClass'. An explicit conversion exists (are you missing a cast?)*/ } }
abstract
var
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