public string Area(double width, double height) { ... } public double Area(double width, double height) { ... }

// This will NOT compile.

If we need to have our class use the same method names that return di erent values, we can remove the issues of ambiguity by implementing an interface and explicitly defining its usage.

public interface IAreaCalculatorString {

public string Area(double width, double height);

}

public class AreaCalculator : IAreaCalculatorString {

public string IAreaCalculatorString.Area(double width, double height) { ... }

//Note that the method call now explicitly says it will be used when called through

//the IAreaCalculatorString interface, allowing us to resolve the ambiguity. public double Area(double width, double height) { ... }

Section 47.8: Access rights

//static: is callable on a class even when no instance of the class has been created public static void MyMethod()

//virtual: can be called or overridden in an inherited class

public virtual void MyMethod()

// internal: access is limited within the current assembly internal void MyMethod()

//private: access is limited only within the same class private void MyMethod()

//public: access right from every class / assembly public void MyMethod()

//protected: access is limited to the containing class or types derived from it protected void MyMethod()

//protected internal: access is limited to the current assembly or types derived from the containing class.

protected internal void MyMethod()