Multiple Inheritance in C#

Does C# support multiple Inheritance ?

No, you cannot inherit from multiple classes. You may use interfaces or a combination of one class and interface(s).

More about.....Multiple inheritance in C#

How do you prevent a class from being inherited ?

In C# you can use the "sealed" keyword in order to prevent a class from being inherited. If you try to attempts to inherit will result in a compilation error.

In VB.Net you can use "NotInheritable" (NonOverrideable for properties)

Also in Java you can use the keyword "final"

More about.....Sealed Classes

Explain namespaces in C# ?

Namespaces are containers that is used to declare a scope that contains a set of related objects. You can use a namespace to organize code elements and to create globally unique types.

Within a namespace, you can declare another namespace, class, interface, struct, enum, and delegates.

Ex:

 
namespace TestNamespace
{
    namespace TestNamespace.Nested
    {
        class NeweClass { }
    }
    enum TestEnum { a, b }
    class TestClass { }
    interface TestInterface { }
    struct TestStruct { }
    delegate void TestDelegate(int i);
}

More about......Net namespaces

How do you convert a value-type to a reference-type ?

You can use Boxing.

What is boxing and unboxing ?

Implicit conversion of value type to reference type of a variable is known as boxing and conversion of reference type variable back to value type is called as UnBoxing.

Ex:

 
int i = 5;
object o = i; //Boxing
int j = (int)o; //Unboxing

More about.....Boxing and Unboxing

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