1. What is
Metadata?
Metadata is termed as “Data about content of the
data” and it is found in the catalog of libraries. Practically, it is used at
back side of book to see the necessary topic.
2. What is
the difference between VB and VB.Net?
Following are the
differences between VB and VB.Net:
|
VB
|
VB.Net
|
|
Platform
dependent
|
Platform
Independent
|
|
VB is backward
compatible
|
VB.Net is not
backward compatible
|
|
Interpreted
|
Compiler
Language
|
|
Exception
Handling by ‘On Error…..Goto’
|
Exception
Handling by ‘Try….Catch’
|
|
Cannot develop
multi-threaded applications
|
Can develop
multi thread applications
|
3. What is
the difference between C# and VB.Net?
Following table gives differences between C# and
VB.Net:
|
VB.Net
|
C#
|
|
Optional
Parameters are accepted
|
Optional
Parameters are not accepted
|
|
Not case
sensitive
|
Case Sensitive
|
|
Nothing is used
to release unmanaged resources
|
‘Using’ is used
to release unmanaged resources
|
|
Support of Both
structured and unstructured error handling
|
Unstructured
error handling
|
4. What is
namespace?
A namespace is an organized way of representing
Class, Structures and interfaces present in .NET language. Namespaces are
hierarchically structured index of a class library, available to all .NET
Languages.
5. Which
namespace are used for accessing the data?
System.Data namespace is used for accessing and
managing data from the required data source. This namespace deals only with the
data from the specified database.
6. What is
JIT?
JIT is termed as Just in Time compiler which is
used as a part of runtime execution environment. There are three types of JIT
and they are:
·
Pre-JIT – Compiles
at the time of deployment of an application
·
Econo-JIT –
Compiles called methods at runtime
·
Normal JIT –
Compiles called methods at runtime and they get compiled first time when called
7. What is an
assembly and its use?
An assembly is one of the elements of a .NET
application and it termed as a primary unit of all .NET applications. This
assembly can be either DLL or executable file.
8. What is
strong name in .NET assembly?
Strong Name is an
important feature of .Net and it is used to identify shared assembly uniquely.
Strong name has solved the problem of creating different object with same name
and it can be assigned with the help of Sn.exe.
9. What are
the different types of assembly?
There are two
types of assembly –
·
Private – A
private assembly is normally used by a single application and it is stored in
application’s directory.
·
Public – A public
assembly or shared assembly is stored in Global Assembly Cache(GAC) which can
be shared by many applications
10. What is
the difference between Namespace and Assembly?
Assembly is
physical grouping of all units and Namespace logically groups classes.
Namespace can have multiple assemblies.
11. What is
INTERNAL keyword in .Net Framework?
INTERNAL keyword is one of the access specifier
which will be visible in a given assembly i.e. in a DLL file. This forms a
single binary component and it is visible throughout the assembly.
12. What are
Option Strict and Option Explicit?
.Net generally
allows implicit conversion of any data types. In order to avoid data loss
during data type conversion, Option Strict keyword is used and it ensures
compile time notification of these types of conversions.
Option Explicit is
the keyword used in a file to explicitly declare all variables using declare
keywords like Dim, Private, Public or Protected. If undeclared variable name
persists, an error occurs at compile time.
13. What is
the use of New Keyword?
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.
|
1
|
Dim frm
As New Form1 frm.show()
|
14. What is
ReDim keyword and its use?
Redim keyword is
exclusively used for arrays and it is used to change the size of one or more
dimensions of an array that has been already declared. Redim can free up or add
elements to an array whenever required.
|
|
Dim
intArray(7, 7) As Integer
ReDim
Preserve intArray(7, 8)
ReDim
intArray(7, 7)
|
15. What is
jagged array in VB.Net?
Jagged
array is nothing but an array of arrays. Each entry in the array is another
array that can hold any number of items.
16. What is
Manifest?
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.
17. What are
all the differences between Dispose and Finalize()?
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.
18. What is
Garbage Collection?
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.
19. What are
the types of generations in garbage collector?
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.
20. What is
the use of Option explicit?
Variable must
be compulsorily declared when the Option Explicit is termed as ON. If
it is OFF, variables can be used without declaration.
21. What is
the difference between System.String and System.StringBuilder classes?
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.
22. What is
the difference between int and int32?
Int32 represent 32-bit signed integer whereas int
is not a keyword used in VB.Net.
23. What is
hashtable?
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.
24. What are
nested classes?
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.
25. What is
Enumerator?
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.
26. What is
Delegate?
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.
Example:
|
public
delegate int performaddition(int z, int b);
|
27. What is
Globalization?
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.
28. What is
the difference between Dataset and Datareader?
|
DataReader
|
Dataset
|
|
Datareader has
read only access to the data and it is set to be forward only.
|
Dataset can hold
more than one table from the same data source. It even stores relationships
between tables.
|
|
Datareader
cannot persist contents as it is read only
|
Dataset
can persist contents
|
|
Datareader is
connected architecture
|
Dataset is
disconnected architecture
|
29. What
is the difference between value and reference types?
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.
30. What is
TRACE in VB.Net?
TRACE allows the
user to view how the code has been executed in detail. This tells how the code
is working.
31. What is
Authentication and Authorization?
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.
32. What are
the types of Authentication?
There are three
types of Authentication and they are –
·
Windows
Authentication
·
Forms
Authentication
·
Passport
Authentication
33. What is
Global Assembly Cache (GAC)?
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
34. What is
CLR?
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)
35. What is
CTS?
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.
36. What is
CLS?
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.
37. What is
Managed code?
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.
38. What is
serialization in .Net?
Serialization is
defined as a process of converting an object to stream of bytes. This is used
mainly to transport objects.
39. How many
languages are supported by .Net?
Following are the
languages supported by VB.Net:
·
C#
·
VB.Net
·
COBOL
·
Perl
40. What is
the difference between Convert.tostring and i.tostring method?
Convert.tostring
handles Null and i.tostring does not handle null.
41. What are
the two main parts of .NET?
They are – Common
Language Runtime (CLR) and .NET Framework class library.
42. What is
the difference between thread and process?
Thread is used to
execute more than one program at a time. Whereas, Process executes single
program at a time.
43. What is
strong typing and weak typing?
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.
44. How many
.NET languages can a single .NET DLL contain?
Only one language
will be supported by one DLL.
45. What is
the class that allows an element to be accessed using Unique key?
Hash table is the
collection class that allows an element to be accessed using Unique key.
46. What is
Code Security?
.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
47. Which DLL Is
used for Microsoft .NET run time?
Mscoree.dll is
used for Microsoft .NET runtime DLL.
48. How many
classes a DLL can contain?
Unlimited number
of classes can be present in a DLL.
49. How can
we store decimal data in .NET?
BinaryWriter is
used to store decimal data in .NET.
50. What is
deep copy?
Deep copy is nothing but creating a new object and
then copying the non-static fields of the current object to new object.