VB Dot Net Developer Interview Preparation Guide

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CLR is abbreviated as Common Language Runtime and it forms heart of the .NET framework. It is the responsibility of runtime to take care of the code execution of the program. CLR takes care of the following:
★ Garbage Collection
★ Code Verification
★ Code Access Security
★ IL (Intermediate Language)

Common Language Specification is a subset of CTS and it is used to unite all languages in to one umbrella. This extends to support all the .NET language into one unit.

Unlimited number of classes can be present in a DLL.

Deep copy is nothing but creating a new object and then copying the non-static fields of the current object to new object.

Managed Code is used to run inside the CLR environment and it is called as .NET run time. All Intermediate Language (IL) are set to be Managed code.

BinaryWriter is used to store decimal data in .NET.

Mscoree.dll is used for Microsoft .NET runtime DLL.

Hash table is the collection class that allows an element to be accessed using Unique key.

.NET framework provides security features to secure code from unauthorized users. There are two types of security in .NET:
★ Role based security - Authorizes User
★ Code access security - Protects system resources from unauthorized calls

Only one language will be supported by one DLL.

Strong type is checking the types of variables at compile time and weak type is checking the types of system as late as possible which is nothing but run time.

Thread is used to execute more than one program at a time. Whereas, Process executes single program at a time.

They are - Common Language Runtime (CLR) and .NET Framework class library.

Serialization is defined as a process of converting an object to stream of bytes. This is used mainly to transport objects.

Convert.tostring handles Null and i.tostring does not handle null.

Following are the languages supported by VB.Net:
★ C#
★ VB.Net
★ COBOL
★ Perl

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.

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.

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

There are three types of Authentication and they are:
★ Windows Authentication
★ Forms Authentication
★ Passport Authentication

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.

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

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.

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

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.