MY.NET Tutorials: C# Q.

.NET Interview Questions and Answers Part 4

On 00:17:00 By RAMASHANKER VERMA // 1 comment:

1.)What is Pinvoke ?
Pinvoke(Platform invoke) is a service that enables managed code to call unmanaged functions implemented in DLLs (dynamic-link libraries), such as those in the Win32 API.

2.)Is it true that COM objects no longer need to be registered on the server??

Yes. It is true that COM objects no longer need to be registered on the server.

3.) Can .NET Framework components use the features of Component Services?

Yes, we can use the features and functions of Component Services from a .NET Framework component.

4.) What are server controls in ASP.NET ?

The Server controls are components that run on the server and encapsulate user-interface and other related functionality. They are used in ASP.NET pages and in ASP.NET code-behind classes.

4.) What is the difference between Web User Control and Web Custom Control ?

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.NET Interview Questions and Answers Part 3

On 01:56:00 By RAMASHANKER VERMA // No comments:

1.) What is CCW ?
This is also called COM Callable Wrapper.A proxy object generated by the common language runtime(CLR) so that existing COM applications can use managed classes, including .NET Framework classes, transparently.
2.) When do we absolutely have to declare a class as abstract ?

When at least one of the methods in the class is abstract.
When the class itself is inherited from an abstract class and no base abstract methods have been over-ridden.

3.)Why can’t we specify the accessibility modifier for methods inside the interface ?

They all must be public. Therefore, to prevent from getting the false impression that we have any freedom of choice, we are not allowed to specify any accessibility, it is public by default.

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General .NET Interview Questions and Answers Part 2

On 11:05:00 By RAMASHANKER VERMA // No comments:

1.) What is .NET Assembly ?
A assembly is the smallest units of versioning and deployment in the .NET Application. In other way :- A single deployment unit is known as an assembly file. We generally use following assembly file in .NET Application.

Web services
Windows Services
Service components
Remoting Application
WCF Services

2.) What are the types of Assembly files in .NET ?

Private assembly
Shared assembly

3.) What is a Strong Name in .NET ?

A Strong Name contains the name of the assembly ,Version number,culture and a public key tokens.

4.) What is difference between private and shared assembly ?
Private assembly:-

Private assembly is used inside an application only.
We can't access it fromout side the application.
It is not identified by a strong Name.

Public or shared assembly:-

Shared assembly can be used in multiple applications.
It can be used inside or outside the applications.
It contains a strong name.

5.) Where is shared assembly file stored ?

Global assembly cache

6.) How to create a strong name for a .NET Application ?
To create a strong Name ,We use a strong Name tool (sn.exe).

7.) Can we place two files with same file name in GAC Folder ?
Yes.

8.) How does GAC differentiate two files with same name ?
GAC does differentiate two files with same name by version number.
Ex.
If first file has version number = 1.0.0.0 then second file has version number = 1.1.0.0

9.) What is delay signing ?
It allows you to place shared assembly in the GAC folder by signing the assembly with public key or private key.

10.) What is design patterns ?
A design patterns are the most important parts of any project life cycle.

A good design patterns is more responsible to success of any projects.
A good design patterns have the potential to permanent change the software engineering field.

11.) What are the types of design patterns ?

Creational patterns
Behavioral patterns
Structure patterns

12.) What is .NET framework ?
The .NET Frameworks is a part of Microsoft.NET . The .NET Frameworks consists of two parts:

.NET Common Language Runtime
.NET Class Library

These two components are packaged together into the .NET Frameworks SDK .You can download it free from microsoft site.

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Multithreading Questions and Answers

On 14:44:00 By RAMASHANKER VERMA // No comments:

1. ) What is thread ?
A thread is basically a separate sequence of instruction designed to performing a " specific task" in the program.

2. ) What is Multithreading in c# ?
Performing multiple task at same time during the execution of a program,is known as multithreading.

3. ) What is the Namespace used for multithreading in c# ?
using System.Threading;

4. ) What are the advantage of multithreading in c# ?
There are two main advantage to use of multithreading in c#.

Optimize the use of computer resources such as memory.
Save time

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Interface and operator overloading Questions and Answers

On 19:07:00 By RAMASHANKER VERMA // 2 comments:

1.) What is an interface in c#?
An interface is a reference type in c#.It is basically a kind of class with some differences,which are given below:-

All the members of an interface are implicitly public and abstract.
We can not declare the interface members as static.
An interface can not contain constructors, destructors and constant fields.
An interface can inherit multiple interfaces.

2.) Can interface contain one or more methods?

Yes, But none of them are implemented in the interface itself.

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File Handling questions and answers

On 20:19:00 By RAMASHANKER VERMA // No comments:

1. ) What are file and stream in asp.net?

A file is typically the principal means by which you can intact with a program .A file can be a data set that you can read,create ,delete,append and modify or a stream of bytes that are generated by the program.

More Details......

2. ) What is Namespace used in file & stream classes?

Using System.IO;

3. ) What is the Directory class ?

Directory class allows to include a buffering layer to read & write operations on the other stream.we can't inherit this class.

4. ) What is the Directory Info class ?

Directory info class provides the instance methods for creating ,moving & enumerating through directories & sub directories.we can not inherit this class.

More Details......

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Exception Handling Questions and Answers

On 21:05:00 By RAMASHANKER VERMA // No comments:

1. ) What is Exception Handling in c# ?
In Exception handling,we provide an alternate path,if some error occurs at run time instead of halting the programs.

2. ) What is Debugging ?
Debugging is the process of identifying and fixing errors in a software program.

3. ) What are the types of error in c# ?
There are three types of error ,which are given below:-

Compile time error
Runtime error
Logical error

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Delegates and Events Questions and Answers

On 13:09:00 By RAMASHANKER VERMA // No comments:

1. ) What do you mean by call-back method?
In object -oriented programming, one object send to message to other objects,The methods are used to callback message are known as callback methods.
C# implements the callback technique in much safer and more object oriented manner,using the help of delegate objects.

2. ) What is the 'type safe' information?

Number of parameters
Types of parameters
Return type
Calling convention

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oops Questions and Answers

On 22:26:00 By RAMASHANKER VERMA // No comments:

1.) What is object oriented programming (oops) Language?
oops is is a methodology to write the program where we specify the code in form of classes and objects .oops supports three important features which are given below:

Encapsulation
Inheritance
Polymorphism

Note:- Abstraction is also basic oops concepts feature.But mainly three important feature of oops.

2.) What is object based Language?

Object based language supports all features of oops except two features which are given below:

Inheritance
Late binding

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Classes and Objects Questions in C#

On 03:05:00 By RAMASHANKER VERMA // No comments:

1. ) what is class in C#?
A class is a user-defined data type with a template that serves to define its properties.
More Details...

2. ) How to declare a class in C#?
Syntax:-
Class class-name
{
variables declaration;
Method declaration;
}
OR

Class class-name
{
//empty class
}

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Structures and Enumerations Questions in C#

On 21:50:00 By RAMASHANKER VERMA // No comments:

1. ) What is structure in C#?
A structure is an user defined data type which can contain different members as variable , Method ,properties etc. Structures are value type and stored on the stack memory.

2. ) What is the advantage of structure in C#?
Structures are stored on the stack,so there are some advantage of structures.

Structure are created more quickly than heap -allocated.
Structures are automatically deallocated ,when it go the out of the scope.
Structures are value type so that we can easily copy value type variables on the stack memory.

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Strings Questions and Answers

On 23:59:00 By RAMASHANKER VERMA // No comments:

1.) What is String?
A string is a combination of sequence of characters.It is one of the built-in types ,provided by .net Framework.

2.) What is Mutable and Immutable string in C#?

Mutable -->means -->change in value
Immutable -->means -->No change in value

More Details..

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Arrays Questions in C#

On 21:24:00 By RAMASHANKER VERMA // No comments:

1. ) What is an array?

An array is a kind of variable which can hold multiple variable for same data type.

2. ) What are the steps involve for creation of an array?

Declaration of Arrays
Creation of Arrays
Initialization of Arrays

More Details..

3. ) What is the syntax for declaration of an array?

type [ ] arrayname;

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Methods Questions in C#

On 00:59:00 By RAMASHANKER VERMA // 1 comment:

1. ) What are the elements used in a Method Declaration?

Name of the Method
Type of value the Method returns ( type)
Lists of parameters
Body of the Method
Method Modifier(access-specifier)

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Decision Making and Looping Questions

On 00:34:00 By RAMASHANKER VERMA // No comments:

1.) What are the Decision making statements in C#?

If statement
Switch statement
Conditional operator statement

2. ) What is the Syntax of Switch statement?

switch(expression)

{

case 1:

...........statements.........

break;

case 2:

...........statements.........

break;

default:

...........statements.........

break;

}

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Operators and Expressions Questions

On 19:44:00 By RAMASHANKER VERMA // No comments:

1. ) What is an operator in C#?
An operator is a symbol that is used to perform certain Mathematical and Logical manipulations. operators are used in program to manipulate data and variables.
More Details...

2. ) What are Special operators in C#?
is Relational operator
as Relational operator
typeof type operator
sizeof size operators
new object creator
.(dot) member-access operator
checked overflow checking
unchecked overflow checking

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Variables and Data Types Questions

On 14:13:00 By RAMASHANKER VERMA // No comments:

1.) What is a collection of Tokens in C#?

There are five types of token in c#.

Keywords
Identifier
Operators
Literals
Punctuators

More Details...

2.) What is Literal?

Literals are the way in which the values that are stored in variables are represented.

More Details...

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General C# Questions

On 15:08:00 By RAMASHANKER VERMA // No comments:

1.) What is a Class?
A class is a user-defined data type.It is like a template.

2.) What is the importance of the Main Method in C# Program?
Every C# program start executing from the main method .We can not run any C# program without Main Method(),so Main Method is more important for executing any C# program.

3.) What are the types of comment styles in c#

Single Line comment (/*......*/)
Multiline comments (// .......)
More Details...

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General .NET Questions and Answers

On 12:43:00 By RAMASHANKER VERMA // No comments:

1.) What is .NET ?

.NET is a platform which is used to develop the different types of Applications..NET Consist on:-

.NET Framework
Visual Studio .NET IDE

2.) What is .NET Framework?

.NET Framework is a Kind of Environment(set of Components) which allow us to develop the different kinds of applications.

Windows -based Applications
Web based Applications
Console Applications
Building Windows Device Driver

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