VB .Net Developer

Finalize method is called by Garbage collector which helps us to make free of unmanaged resources. There are some other resources like window handles, database connections are handled by iDisposable interface.

Dispose method is handled by IDisposable interface to explicitly release unused resources. Dsipose can be called even if other references to the object are alive.

Garbage collection is also known as automatic memory management, which is used for automatic recycling of dynamically allocated memory. Garbage collection is performed by Garbage collector which will recycle memory if it is proven that memory will be unused.

New keyword is used with the constructor in which it can be used as a modifier or an operator. When it is used as a modifier, it hides inherited member from the base class member. When it is used as an operator, it creates an object to invoke constructors.

Dim frm As New Form1 frm.show()

A Manifest is a text file that is used to store metadata information of .NET assemblies. File type of Manifest can be saved as a type PE. Assembly Name, Version, Culture and key token can be saved as a Manifest.

Variable must be compulsorily declared when the Option Explicit is termed as ON. If it is OFF, variables can be used without declaration.

System.string class is non-updatable and it will create new string object instead of updating the same. But updation in the same string object is possible for String. Stringbuilder class. So, the operation on string builder is faster and efficient than the string class.

Int32 represent 32-bit signed integer whereas int is not a keyword used in VB.Net.

Hashtable is set to be items with key and value pairs. Keys are referred as indexes and quick search can be performed for values by searching through the keys.

A class that can be declared within the scope of another class. These classes are considered within the scope of the enclosed class and are available within that class or scope.

An Enumerator or Enum is a value type with a set of constants given to the set of the list. Enumeration is used when definition is required for more than one number.

A delegate is defined as an object that can refer to a method. Whenever a delegate is assigned to a method, it behaves exactly like that method.

Globalization is nothing but making the application Internationalize and localizing the application to other languages or cultures. Culture is nothing but a combination of Language(English) and the location like US or UK.

DataReader:

★ Datareader has read only access to the data and it is set to be forward only.

★ Datareader cannot persist contents as it is read only

★ Datareader is connected architecture

Dataset:

★ Dataset can hold more than one table from the same data source. It even stores relationships between tables.

★ Dataset can persist contents

★ Dataset is disconnected architecture

Value types directly store the data and it is allocated to stack. Reference type store a reference to the value's memory address and are allocated to heap.

TRACE allows the user to view how the code has been executed in detail. This tells how the code is working.

Authentication is the process of obtaining credentials from the users and verifying the user's identity. Authorization is the process of giving access to the authenticated resources. Authentication leads to Authorization.

There are three types of Authentication and they are:

★ Windows Authentication

★ Forms Authentication

★ Passport Authentication

GAC is used where shared .NET assembly resides. It is used in the following criteria:

★ If .Net assembly has special security requirements

★ If .Net application has to be shared with other applications

CTS is Common Type System which is used to communicate smoothly between the languages. For example, if VB has Integer data type and C++ has long data type and these data types are not compatible.

In order to be compatible, CTS can be used as an interface between two languages.

There are three types of generations in garbage collector.

Generation 0 - This identifies a newly created object that has been never marked for collection.

Generation 1 - This identifies an object which has been marked as collection but not removed.

Generation 2 - This identifies an object that has survived more than one sweep of the Garbage collector.