Implement Delegates in C#.NET

Explain how to implement Delegates in C#.NET?


Here is an implementation of a very simple delegate that accepts no parameters.


public delegate void MyDelegate();// Declaration
class MyClass
{
     public static void MyFunc()
     {
         Console.WriteLine("MyFunc Called from a Delegate");
     }
     public static void Main()
     {
            MyDelegate myDel = new MyDelegate(MyFunc);
            myDel();
      }
}

What is assembly in .NET

Define assembly.


An assembly is the primary unit of a .NET application. It includes an assembly manifest that describes the assembly.

How Obfuscator works

Explain how Obfuscator works?


Obfuscators protect the source code from being hacked. Encryption and Decryption are processes from where you can get the data back. However these differ from what obfuscation is. In obfuscation, a program become out of the reach of hackers although it functions the same way it is supposed to. Optimizations too get applied to the process of obfuscation in order to make the program fast.



Obfuscator simply renames all types and namespace etc to meaningless code making it non human readable. This diminishes the possibility of reverse engineering. For example


private void AddEmp(Employee employee) 
{
   {
      this.EmpList.Add(employee);
   }
}


It gets converted to following code.


private void a(a b) 
{
    {
      a.a.Add(b);
    }
}

Abstract classes in C#.NET

Define abstract class in C#.NET.


Abstract classes in C#.NET has following features :
Abstract class cannot be instantiated.
Same concept in C++ known as pure virtual method. 
A class that must be inherited and have the methods over-ridden. 
A class without any implementation.

Constructor and Destructor in .NET

What is a Constructor? 


It is the first method that are called on instantiation of a type. It provides way to set default values for data before the object is available for use. Performs other necessary functions before the object is available for use.


What is a Destructor?


It is called just before an object is destroyed. It can be used to run clean-up code. You can't control when a destructor is called since object clean up by common language runtime.