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:
1.Pre-JIT – Compiles at the time of deployment of an
application
2.Econo-JIT – Compiles called methods at runtime
3.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.
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.
Example:
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.
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