Guru Jambheshwar University assignment

M.Sc. - Master of Computer Science - Guru Jambheshwar University of Science & Technology

Questions

1.      Write short note on

a)     Overriding

  Method overriding in C# is a feature like the virtual function in C++. Method overriding is a feature that allows you to invoke functions (that have the same signatures) that belong to different classes in the same hierarchy of inheritance using the base class reference. C# makes use of two keywords: virtual and overrides to accomplish Method overriding. Let's understand this through small examples.

P1.cs

class BC

{ 

public void Display()

  

{    

 System.Console.WriteLine("BC::Display");

  

}

} 

class DC : BC

{  

new public void Display()

  

{  

   

System.Console.WriteLine("DC::Display");

  

}

} 

class Demo

{ 

public static void Main()

  

{    

 BC b;     b = new BC();

     b.Display();

  

  }

}

Output

BC::Display.  a)     Inheritance

     If you run this example, you will notice that even though we have not defined a Greet() method for the Dog class, it still knows how to greet us, because it inherits this method from the Animal class. However, this greeting is a bit anonymous, so let's customize it when we know which animal it is:

public class Animal

{    

public virtual void Greet()   

 {        

Console.WriteLine("Hello, I'm some sort of animal!");  

 

 }

} 

public class Dog : Animal

{    

public override void Greet()  

 

 {     

   Console.WriteLine("Hello, I'm a dog!"); 

   }

}

   Describe NGWS Component and XML?

 

 XML is short for eXtensible Markup Language. It is a very widely used format for exchanging data, mainly because it's easy readable for both humans and machines. If you have ever written a website in HTML, XML will look very familiar to you, as it's basically a stricter version of HTML. XML is made up of tags, attributes and values and looks something like this:

<users>

<user name="John Doe" age="42" />

<user name="Jane Doe" age="39" />

</users>

As you can see, for a data format, this is actually pretty easy to read, and because it's such a widespread standard, almost every programming language has built-in functions or classes to deal with it. C# is definitely one of them, with an entire namespace, the System.Xml namespace, to deal with pretty much any aspect of XML. In the following chapters, we will look into using them, both for writing and reading XML. 

C# application 

C# application types include Windows Console applications, Windows Forms applications, ASP.NET Web applications, ASP.NET Web Service applications, Smart Device applications, ActiveX applications, and setup and deployment applications.

Console applications use standard command-line input and output for input and output instead of a form. Console applications use the System.IOclass for handling input and output. You can use the class name in front of methods, such as System.IO.Console.WriteLine(), or include ausing statement at the start of your program. Console applications are easy to create by using Visual Studio and other development environments that include any text editor, such as Notepad.

Windows Applications

Windows applications have the familiar graphical user interface of Windows with controls such as buttons and list boxes for input. The most visually stunning Windows applications are based on Windows Presentation Foundation.

Windows Forms are used to create basic graphical user interfaces in a RAD application environment. Windows Forms applications use classes in the System.Windows.Forms namespace. Forms applications are easy to create using Visual Studio and other development environments that include any text editor, such as Notepad.

Microsoft Silverlight is a cross-browser, cross-platform, and cross-device plug-in for delivering the next generation of .NET based media experiences and rich interactive applications for the Web. For more information, see the Microsoft Silverlight web site.