DirectCast requires the run-time type of an object variable to bethe same as the specified type.The run-time
performance ofDirectCast is better than that of CType, if the specified type and the run-time typeof the
expression are the same.
Ctype works fine if there is a valid conversion defined between the expression and the type.
 

Manifest is metadata about assemblies. It describes assembly itself like
Assembly Name, version number, culture, strong name, list of all files, Type references, and referenced
assemblies.

Metadata is machine-readable information about a resource, or “”data about data.” In .NET, metadata includes
type definitions, version information, external assembly references, and other standardized information.
Metadata describes contents in an assembly classes, interfaces, enums, structs, etc., and their containing
namespaces, the name of each type, its visibility/scope, its base class, the interfaces it implemented, its
methods and their scope, and each method’s parameters, type’s properties, and so on.
 

Two types of properties in .Net: Get & Set
 

Constructor is a method in the class which has the same name as the class (in VB.Net its New()). It initializes
the member attributes whenever an instance of the class is created.
 

There is a perfect tool provided by .net frameworks called Garbage collector, where by mean of GC we can clean
up the object and reclaim the memory. The namespace used is System.GC.
 

Public/public All members in all classes and projects.
Private/private Members of the current class only.
Friend/internal All members in the current project.
Protected/protected All members in the current class and in classes derived from this member’s class. Can be
used only in member definitions, not for class or module definitions. Protected Friend/protected internal All
members in the current project and all members in classes derived from this member’s class. Can be used only in
member definitions, not for class or module definitions.
 

Value type - bool, byte, chat, decimal, double, enum , float, int, long, sbyte, short, strut, uint, ulong,
ushort. Value types are stored in the Stack
Reference type - class, delegate, interface, object, string Reference types are stored in the Heap.
 

1. VB.net is object oriented
2. VB.Net can be used in Managed Code
3. It supports inheritance, implements
4. Powerful Exception handling mechanism
5. Have support for the console based applications
6. More than one version of dll is supported
7. Supports the Disconnected data source by using Dataset class
8. Supports threading
 

The serialization is the process of converting the objects into stream of bytes.
they or used for transport the objects(via remoting) and persist objects(via files and databases)
 

By using System.Diagnostics.Process class, we can provide access to the files which are presented in the local
and remote system.
Example: System.Diagnostics.Process(”c:\mlaks\example.txt”) — local file
System.Diagnostics.Process(”http://www.url.com\example.txt”) — remote file
 

1. Windows: Basic, digest or Integrated windows authentication
2. Microsoft passport Authentication
3. Forms Authentication
4. Client Certificate Authentication
 

When .NET was introduced it came with several languages. VB.NET, C#, COBOL and Perl, etc. The site
http://www.dotnetlanguages.net/DNL/Default.aspx says 44 languages are supported
 

can treat the ADO.Net as a separate in-memory database where in I can use relationships between the tables and
select insert and updates to the database. I can update the actual database as a batch.
 

It would work fine. As the runtime type of 123.34 would be double, and Double can be converted to Integer.
 

It would throw an InvalidCast exception as the runtime type of 123.34 (double) doesnt match with Integer.