Vickys Progr@mming environment

• Destructors are the special methods that r used to release the instance of the class from memory.
• The main purpose of it is to perform the memory clean up action. the programmer can not have any control to call the destructor.
  
• The .Net frame work automatically runs the destructor to destroy objects in the memory.
  
• A single class can have only one destructor.

• Destructor follows the same rules as that of constructors but the difference comes in the functioning.
  
• Destructor has same name as class name as its class but is prefixed with a '~' called as tilde operator.
  
• Destructors can not be inherited or overloaded.
  

static int n1,n2;
int total;

n1=5;
n2=3;
total=0;

total=n1+n2;
Console.WriteLine("The result is {0}", total);

Console.WriteLine("Destructor invoked");

Addition obj=new Addition();
obj.operation();

• It is a process that automatically frees the memory space which is used for the objects at the time of program execution.
  
• The memory for the object is freed only after observing the status of the object (i.e when object is no longer in use).
  
• The decision to invoke the destructor is made by a special program of C# called as garbage collector.
• In C#, you can not destroy an object explicitly in code, in fact it has the feature of garbage collection which destroys the objects for the programmers.
  
• Garbage collection mainly involves,
  

1. objects get destroyed: doesnt specify when the object is destroyed.
   
2. Only unused objects are destroyed: object is nt deleted unless it holds any reference.
   

• C# uses two special methods to release the instance of a class from memory

1. Finalize()
2. Dispose()
   

• Finalize destructor is a special method that is called from the class to which it belongs or from the derived class.
  
• It is called only after the last reference of the object is released from the memory.
  
• .Net frame work automatically runs the Finalize() destructor to destroy objects in the memory. and keep in mind that the Finalize method does nt invoke immediately.
  

• Dispose() method is called to release a resource, such as a database connection as soon as the object using such a resource is no longer in use.
  
• Unlike the Finalize() destructor , the Dispose() method is not called automatically, and you must explicitly call it from the client application when an object is no longer needed.
  
• IDisposable interface contains the Dispose() method. So in order to invoke the Dispose() method a class must implement the IDisposable interface.