CoolInterview.com - World's Largest Collection of Interview Questions
Start Your Own website Now
Sponsored Links

Interview Questions
Our Services

Get 9,000 Interview Questions & Answers in an eBook.


  • 9500+ Pages
  • 9000 Question & Answers
  • All Tech. Categories
  • 14 MB Content

    Get it now !!



    Send your Resume to 6000 Companies


  • INTERVIEW QUESTIONS MICROSOFT C# DETAILS
    Question :
    What does the keyword virtual mean in the method definition?


    Category C# Interview Questions
    Rating (0.4) By 1713 users
    Added on 7/28/2006
    Views 3986
    Rate it!
    Answers:

    If a base class have a virtual method it means that method must be override by the derived class using override keyword.



    A virtual function is a member function of a class, whose functionality can be over-ridden in its derived classes
    or its called do nothing function .



    Posted by: Ajay Verma    

    Contact Ajay Verma Contact Ajay Verma

    virtual keyword is used in the base class method
    when derived class use virtual method we use override key with derived class method and the implementation of method can be changed but not affecting the type signature of base class.

    eg: base class
    public virtual method1()
    {
    int a,b,c;
    c=a+b;
    Console.WriteLine(c);
    }

    derived class

    public override method1()
    {
    int a,b,c;
    c=a*b;
    Console.WriteLine(c);
    }




    Posted by: ranjeeth    

    Contact ranjeeth Contact ranjeeth

    virtual meathod is define in base class and which is over-ridden in child class..
    base:class
    public virtual method1()
    {
    string c="virtual method1"
    Console.WriteLine(c);
    }

    derived class

    public override method1()
    {
    string c="override meathod"
    Console.WriteLine(c);
    }



    Posted by: rahil mohd    

    Contact rahil mohd Contact rahil mohd

    If a Method is declared as Virutval in Base class then you can override the Method in derived Class by using Override keyword.

    class Program
    {
    static void Main(string[] args)
    {
    CA a;
    a= new CB();
    a.Foo();
    }

    }
    class CA
    {
    public virtual void Foo()
    {
    Console.WriteLine("Foo in parent Class");
    }
    }
    class CB : CA
    {

    public override void Foo()
    {
    Console.WriteLine("Foo in Child Class");
    }
    }



    Posted by: Nageswara Rao    

    Contact Nageswara Rao Contact Nageswara Rao

    Basically virtual method has drastical affect on performance of application. No Doubt we can do all the things without virtual function but if we use Virtual then we have following benefits.

    1. Same of name of function can be used in derived class after overriding and can change its body there but with same signature

    2. Overrided function will point to same memory location that is of the virtual function. means same memory location can be shared.



    Posted by: Gurpreet Singh    

    Contact Gurpreet Singh Contact Gurpreet Singh

    A method declared as virtual in the base class can be implemented in the derived class with override keyword. But it is not a must. If we use new keyword it hides the method



    Posted by: Titty Louis    

    Contact Titty Louis Contact Titty Louis

    Hi



    Posted by: virgosnow    

    Contact virgosnow Contact virgosnow

    virtual means to call the right method in the scenario of inheritance. This is runtime polymorphism

    Thanks.



    Posted by: Manjushree     

    Contact Manjushree Contact Manjushree

    The "virtual" keyword is used in a method declaration when the method is intended to be overridden in the derived class, this is used in polymorphism. in this case, when you call this method in a derived class instance that is referred to by a base class reference, then the overridden version of the method will be called.

    When you declare a base class method as virtual then you can use the keyword "override" in the derived class version of the method. If you don't use the "override" keyword then you need to use the "new" keyword instead to "hide" the base class version, otherwise the compiler will issue a warning, just to make sure you know what you are doing!



    Posted by: Mourad    

    Contact Mourad Contact Mourad

    If you have the better answer, then send it to us. We will display your answer after the approval.
    Rules to Post Answers in CoolInterview.com:-

  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.
  • Name :*
    Email Id :*
    Answer :*
    Verification Code Code Image - Please contact webmaster if you have problems seeing this image code Not readable? Load New Code
    Process Verification  Enter the above shown code:*
    Inform me about updated answers to this question

       
    Related Questions
    View Answer
    How's method overriding different from overloading?

    View Answer
    What's the top .NET class that everything is derived from?

    View Answer
    Describe the accessibility modifier protected internal.

    View Answer
    Are private class-level variables inherited?

    View Answer
    When you inherit a protected class-level variable? Who is it available to?

    View Answer
    Does C# support multiple inheritance?

    View Answer
    How do you inherit from a class in C#?

    View Answer
    What's the implicit name of the parameter that gets passed into the class' set method?

    View Answer
    Is it mandatory to implement all the methods which are there in abstract class if we inherit that abstract class..?

    View Answer


    What is the difference between const and static read-only?



    View Answer
    How to fill datalist usinf XML file and how to bind it,code behind language is c#

    View Answer
    WHAT IS THE ADVANTAGE OF SERIALIZATION?

    View Answer
    How we hand sql exceptions? What is the class that handles SqlServer exceptions?

    View Answer
    What is indexer? where it is used plz explain

    View Answer
    can we inherit the java class in C# class,how?

    View Answer
    We declare an integer variable 'x' in C# as

    View Answer
    A code block in C# is enclosed between

    View Answer
    To read user input from the console, the following statement is used

    View Answer
    The following is a correct call to the Main() function

    View Answer
    All the C# programs must have the following statement

    View Answer


    Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here Vyoms.com - Best Freshers & Experienced Jobs Website.

    View ALL C# Interview Questions

    User Options
    Sponsored Links


    Copyright ©2003-2014 CoolInterview.com, All Rights Reserved.
    Privacy Policy | Terms and Conditions

    Download Yahoo Messenger | Placement Papers| FREE SMS | ASP .Net Tutorial | Web Hosting | Dedicated Servers | C Interview Questions & Answers

    Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes


    Cache = 0.030273 Seconds