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In this video you will get information on C# - Oops.

Static and Dynamic Binding
Virtual methods are dynamically bound i.e., the actual method called would be decided at runtime and the decision is based on the object to which the reference variable invoking the method is referring to.

Methods not declared as virtual are statically bound i.e., the actual method invoked would be decided at compile time and is based on purely the data type of the reference variable invoking the method irrespective of the object the reference variable is referring to.

Using a reference variable of type parent - Child class method can execute only if
1. Method of the parent must be declared as virtual
2. Child class object is created
3. Child class overrides the parent class method.

• If the class of the reference variable has the method declared as virtual then it is dynamic binding otherwise it's static binding.
• Static binding gives better performance than dynamic binding.
Try the above program with and without “virtual” and “override” keywords in both “CParent” and “CChild” classes.
• If the object is of child class and the child class “overrides” the method only then the child class method is executed. Otherwise, it will always execute the parent class method.
• Only virtual methods or overridden methods of the parent class can be overridden in the child class.
• A method declared as “new” can also be declared as “virtually new” and such methods shadows the parent class method but can be overridden in the child class if needed.
• A class declared as sealed cannot be inherited.
• A method declared as sealed cannot be overridden in the child class.
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