Answer / belson gnana pradeep

Virtual methods those can be overridden and replaced by sub classes.
When working with virtual methods keep in mind datatype of
an object is used to determine the implementation of
the method to call, rather than the type of the variable
that refers to an object.

In C#, a base class must provide the "virtual" modifier for
any virtual method, and derived classes must provide the
"override" modifier for any overriden method inherited from
a base class.

In VB.NET, a base class must provide the "Overridable"
modifier for any virtual method, and derived classes may
provide the optional "Overrides" modifier for any overriden
method inherited from a base class

Answer / mahesh babu ummaneni

virtual is nothing but it is a keyword ,when we diclare a method with virtual key word in base class thet method must be overroden in derived class

Answer / ssss

Virtual functions are used to override the derived class.If
u r using the virtual keyword u must override the the
derived class

what is unit testing

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