Wednesday, 4 February 2015

20 Top .NET INTERVIEW QUESTION FRESHERS || 20 General .NET Interview Questions



                                   INTERVIEW QUESTION FOR FRESHERS



1 :: How many languages .NET is supporting now?
When .NET was introduced it came with several languages.
VB.NET,
C#,
COBOL
and
Perl, etc.
The site DotNetLanguages.Net says 44 languages are supported by .NET 
.net version 2.0 is able to support upto 40+ languages and
 .net 3.5 version can support upto 60+ languages .
2 :ASP.NET Page Life Cycle Events ?

Methods Description
Page_Init Page Initialization
LoadViewState View State Loading
LoadPostData Postback Data Processing
Page_Load Page Loading
RaisePostDataChangedEvent PostBack Change Notification
RaisePostBackEvent PostBack Event Handling
Page_PreRender Page Pre Rendering Phase
SaveViewState View State Saving
Page_Render Page Rendering
Page_Unload Page Unloading


3 :: How ASP .NET different from ASP?
Scripting is separated from the HTML, Code is compiled as a DLL, these DLLs can be executed on the server.

4 :: How is .NET able to support multiple languages?

A language should comply with the Common Language Runtime standard to become a .NET language. In .NET, code is compiled to Microsoft Intermediate Language (MSIL for short). This is called as Managed Code. This Managed code is run in .NET environment. So after compilation to this IL the language is not a barrier. A code can call or use a function written in another language.



5 :: What is view state in .NET?
The web is stateless. But in ASP.NET, the state of a page is maintained in the in the page itself automatically. How? The values are encrypted and saved in hidden controls. this is done automatically by the ASP.NET. This can be switched off / on for a single control
ebsite without using IIS.
6 :: How do you validate the controls in an ASP .NET page?
Using special validation controls that are meant for validation of any controle.
We have Range Validator, Email Validator in .NET to validate any control.
7 :: Can the validation be done in the server side? Or this can be done only in the Client side?
Client side is done by default. Server side validation is also possible in .NET. We can switch off the client side and server side can be done only in .NET
8 :: What is "Common Language Specification" (CLS) in .NET?

CLS is the collection of the rules and constraints that every language (that seeks to achieve .NET compatibility) must follow. It is a subsection of CTS and it specifies how it shares and extends one another libraries.




9 :: What is ADO .NET and what is difference between ADO and ADO.NET?
ADO.NET is stateless mechanism. I 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
10 :: What is Machine.config in .NET?
Machine configuration file: The machine.config file contains settings that apply to the entire computer. This file is located in the %runtime install path%Config directory. There is only one machine.config file on a computer. The Machine.Config file found in the "CONFIG" subfolder of your .NET Framework install directory (c:WINNTMicrosoft.NETFramework{Version Number}CONFIG on Windows 2000 installations). The machine.config, which can be found in the directory $WINDIR$Microsoft.NETFrameworkv1.0.3705CONFIG, is an XML-formatted configuration file that specifies configuration options for the machine. This file contains, among many other XML elements, a browserCaps element. Inside this element are a number of other elements that specify parse rules for the various User-Agents, and what properties each of these parsings supports.

For example, to determine what platform is used, a filter element is used that specifies how to set the platform property based on what platform name is found in the User-Agent string. Specifically, the machine.config file contains:

platform=Win95
platform=Win98
platform=WinNT
...
11 :: What is Web.config in .NET?
In classic ASP all Web site related information was stored in the metadata of IIS. This had the disadvantage that remote Web developers couldn't easily make Web-site configuration changes. For example, if you want to add a custom 404 error page, a setting needs to be made through the IIS admin tool, and you're Web host will likely charge you a flat fee to do this for you. With ASP.NET, however, these settings are moved into an XML-formatted text file (Web.config) that resides in the Web site's root directory. Through Web.config you can specify settings like custom 404 error pages, authentication and authorization settings for the Web sitempilation options for the ASP.NET Web pages, if tracing should be enabled, etc. The Web.config file is an XML-formatted file. At the root level is the tag. Inside this tag you can add a number of other tags, the most common and useful one being the system.web tag, where you will specify most of the Web site configuration parameters. However, to specify application-wide settings you use the tag.
12 :: What is the difference between ADO and ADO.NET?
ADO uses Recordsets and cursors to access and modify data. Because of its inherent design, Recordset can impact performance on the server side by tying up valuable resources. In addition, COM marshalling - an expensive data conversion process - is needed to transmit a Recordset. ADO.NET addresses three important needs that ADO doesn't address:

1. Providing a comprehensive disconnected data-access model, which is crucial to the Web environment
2. Providing tight integration with XML, and
3. Providing seamless integration with the .NET Framework (e.g., compatibility with the base class library's type system). From an ADO.NET implementation perspective, the Recordset object in ADO is eliminated in the .NET architecture. In its place, ADO.NET has several dedicated objects led by the DataSet object and including the DataAdapter, and DataReader objects to perform specific tasks. In addition, ADO.NET DataSets operate in disconnected state whereas the ADO RecordSet objects operated in a fully connected state.
In ADO, the in-memory representation of data is the recordset. In ADO.NET, it is the dataset. A recordset looks like a single table. If a recordset is to contain data from multiple database tables, it must use a JOIN query, which assembles the data from the various database tables into a single result table. In contrast, a dataset is a collection of one or more tables.
13. What is .NET and .NET Framework?
It is a Framework in which Windows applications may be developed and run. The Microsoft .NET Framework is a platform for building, deploying, and running Web Services and applications. It provides a highly productive, standards-based, multi-language environment for integrating existing investments with next-generation applications and services as well as the agility to solve the challenges of deployment and operation of Internet-scale applications. The .NET Framework consists of three main parts: the common language runtime, a hierarchical set of unified class libraries, and a componentized version of Active Server Pages called ASP.NET. The .NET Framework provides a new programming model and rich set of classes designed to simplify application development for Windows, the Web, and mobile devices. It provides full support for XML Web services, contains robust security features, and delivers new levels of programming power. The .NET Framework is used by all Microsoft languages including Visual C#, Visual J#, and Visual C++.
14. What is "Common Type System" (CTS) in .NET?
CTS defines all of the basic types that can be used in the .NET Framework and the operations performed on those type.
All this time we have been talking about language interoperability, and .NET Class Framework. None of this is possible without all the language sharing the same data types. What this means is that an int should mean the same in VB, VC++, C# and all other .NET compliant languages. This is achieved through introduction of Common Type System (CTS).
15.How to manage pagination in a page using .NET?

Using pagination option in DataGrid control is available in .NET. We have to set the number of records for a page, then it takes care of pagination by itself automatically.


16. What is "Common Language Runtime" (CLR) in .NET?
CLR is .NET equivalent of Java Virtual Machine (JVM). It is the runtime that converts a MSIL code into the host machine language code, which is then executed appropriately. The CLR is the execution engine for .NET Framework applications. It provides a number of services, including:

- Code management (loading and execution)
- Application memory isolation
- Verification of type safety
- Conversion of IL to native code.
- Access to metadata (enhanced type information)
- Managing memory for managed objects
- Enforcement of code access security
- Exception handling, including cross-language exceptions
- Interoperation between managed code, COM objects, and pre-existing DLL's (unmanaged code and data)
- Automation of object layout

17.What is an assembly in .NET?
An assembly is the primary building block of a .NET Framework application. It is a collection of functionality that is built, versioned, and deployed as a single implementation unit (as one or more files). All managed types and resources are marked either as accessible only within their implementation unit, or as accessible by code outside that unit. .NET Assembly contains all the metadata about the modules, types, and other elements it contains in the form of a manifest. The CLR loves assemblies because differing programming languages are just perfect for creating certain kinds of applications. For example, COBOL stands for Common Business-Oriented Language because it’s tailor-made for creating business apps. However, it’s not much good for creating drafting programs. Regardless of what language you used to create your modules, they can all work together within one Portable Executable Assembly. There’s a hierarchy to the structure of .NET code. That hierarchy is Assembly - > Module -> Type -> Method." Assemblies can be static or dynamic. Static assemblies can include .NET Framework types (interfaces and classes), as well as resources for the assembly (bitmaps, JPEG files, resource files, and so on). Static assemblies are stored on disk in portable executable (PE) files.
18. What is a Web Service in .NET? 

A web service is a software component that exposes itself through the open communication channels of the Internet. Applications running on remote machines, on potentially different platforms, can access these components in a language and platform-independent manner. A Web Service is a group of functions, packaged together for use in a common framework throughout a network.
19. What is the difference between a namespace and assembly name in .NET?
A namespace is a logical naming scheme for types in which a simple type name, such as MyType, is preceded with a dot-separated hierarchical name. Such a naming scheme is completely under control of the developer. For example, types MyCompany.FileAccess.A and MyCompany.FileAccess.B might be logically expected to have functionally related to file access. The .NET Framework uses a hierarchical naming scheme for grouping types into logical categories of related functionality, such as the ASP.NET application framework, or remoting functionality. Design tools can make use of namespaces to make it easier for developers to browse and reference types in their code. The concept of a namespace is not related to that of an assembly. A single assembly may contain types whose hierarchical names have different namespace roots, and a logical namespace root may span multiple assemblies. In the .NET Framework, a namespace is a logical design-time naming convenience, whereas an assembly establishes the name scope for types at run time. 

20. What does the term immutable mean?

The data value may not be changed.  Note: The variable value may be changed, but the original immutable data value was discarded and a new data value was created in memory.

Tuesday, 3 February 2015

50 Top interview questions on asp.net || - dotnetallprograms

Subscribe to webcodeexpert.com

Comment Below Your's Gmail Id .I will maill the answers

 

If u want Answer Check in my Facebook page post  the Answers Shortly  :- Dotnetpprograms


1)What is the difference between Web Services and WCF.

2)What are the different ways of hosting a WCF service.

3)Explain the different types of triggers in SQL Server.

4)Difference between BasicHttpBinding and WSHttpBinding.

5)What are the different types of assemblies available in .NET?

6)What is a strong name and how do you give a strong name to an assembly?

7)What is InsteadOf trigger.

8)Can we use Insert/Update statements in views in SQL Server

9)What are abstract classes and Interface and what is the difference between the two.

10)What are the advantages of Interface over abstract classes. I was unable to answer this and they needed the answer in detail. So they gave me some clues in order to arrive at the proper answer from me.

11)What is a sealed class?

12)What is Garbage Collection. How is Garbage Collector invoked in .NET.

13)Can you force Garbage Collector to be invoked from c# code.

14)how is var keyword used in .NET

15)difference between var and dynamic keywords.

16)Difference between Stored Procedures and Functions.

17)What is the difference between BasicHttpBinding and WSHttpBinding(repeated question).

18)What are the different types of contracts available in WCF(DataContract,MessageContract,ServiceContract,MessageContract,OperationContract).

19)What are the different caching techniques available in .NET?
 
20) What is CLS?

21) What is the difference between CLS and CTS?

22) Is overloading possible in web services?

23) What is the difference between this version and earlier versions of .NET?

24) How to implement caching in .NET framework?

25)Difference between HTML Control and Server Control
26)What is meaning of assembly
27)  Difference between hashtable and arraylist

28) What are Generics ?
29)Write the syntax of trigger?
30)What are the different caching techniques available in .NET?

31)Definition of encapsulation, inheritance and other OOPS concepts.
32)Difference between HTML and webserver control.

33)Difference between BRS and SRS.

34)What are different methods exposed by DataAdapter.

35)Difference between connected and disconnected architecture.

36)What are different controls in asp.net

37)Have you used NUnit.

38)Have you used TFS, VSS.

39)Write a class for Dataprovider.

40)What is clustered and nonclusterd index which column is preferred for non clusterindex?

41)What if I make the dropdown view state false ?

42)What are the different state management techniques?

If u want Answer Check in my facebook page Dotnetpprograms



Constructor types with example programs in C#.NET


Constructor is a special method of a class which will invoke automatically whenever instance or object of class is created. Constructors are responsible for object initialization and memory allocation of its class. If we create any class without constructor, the compiler will automatically create one default constructor for that class. There is always at least one constructor in every class.

Here you need to remember that a class can have any number of constructors and constructors don’t have any return type, not even void and within a class we can create only one static constructor.

Generally constructor name should be same as class name. If we want to create constructor in a class we need to create a constructor method name same as class name check below sample method for constructor


class SampleA
{
public SampleA()
{
Console.WriteLine("Sample A Test Method");
}
}

Types of Constructors

Basically constructors are 5 types those are

      1.    Default Constructor
      2.    Parameterized Constructor
      3.    Copy Constructor
      4.    Static Constructor
      5.    Private Constructor

Default Constructor

A constructor without having any parameters called default constructor. In this constructor every instance of the class will be initialized without any parameter values like as shown below


using System;
namespace ConsoleApplication3
{
class Sample
{
public string param1, param2;
public Sample()     // Default Constructor
{
param1 = "Welcome";
param2 = "Dotnet - world";
}
}
class Program
{
static void Main(string[] args)
{
Sample obj=new Sample();   // Once object of class created automatically constructor will be called
Console.WriteLine(obj.param1);
Console.WriteLine(obj.param2);
Console.ReadLine();
}
}
}
When we run above program it will show output like as shown below

Output


Welcome
Dotnet - world

Parameterized Constructors

A constructor with at least one parameter is called as parameterized constructor. In parameterized constructor we can initialize each instance of the class to different values like as shown below


using System;
namespace ConsoleApplication3
{
class Sample
{
public string param1, param2;
public Sample(string x, string y)     // Declaring Parameterized constructor with Parameters
{
param1 = x;
param2 = y;
}
}
class Program
{
static void Main(string[] args)
{
Sample obj=new Sample("Welcome","Dotnet - world");   // Parameterized Constructor Called
Console.WriteLine(obj.param1 +" to "+ obj.param2);
Console.ReadLine();
}
}
}
When we run above program it will show output like as shown below

Output


Welcome to Dotnet - world

Constructor Overloading

In c# we can overload constructor by creating another constructor with same method name and different parameters like as shown below


using System;
namespace ConsoleApplication3
{
class Sample
{
public string param1, param2;

public Sample()     // Default Constructor
{
param1 = "Hi";
param2 = "I am Default Constructor";
}
public Sample(string x, string y)     // Declaring Parameterized constructor with Parameters
{
param1 = x;
param2 = y;
}
}
class Program
{
static void Main(string[] args)
{
Sample obj = new Sample();   // Default Constructor will Called
Sample obj1=new Sample("Welcome","Dotnet - world");   // Parameterized Constructor will Called
Console.WriteLine(obj.param1 + ", "+obj.param2);
Console.WriteLine(obj1.param1 +" to " + obj1.param2);
Console.ReadLine();
}
}
When we run above program it will show output like as shown below

Output


Hi, I am Default Constructor
Welcome to Dotnet - world


Copy Constructor

A parameterized constructor that contains a parameter of same class type is called as copy constructor. Main purpose of copy constructor is to initialize new instance to the values of an existing instance. Check below example for this


using System;
namespace ConsoleApplication3
{
class Sample
{
public string param1, param2;
public Sample(string x, string y)
{
param1 = x;
param2 = y;
}
public Sample(Sample obj)     // Copy Constructor
{
param1 = obj.param1;
param2 = obj.param2;
}
}
class Program
{
static void Main(string[] args)
{
Sample obj = new Sample("Welcome", "Dotnet - world");  // Create instance to class Sample
Sample obj1=new Sample(obj); // Here obj details will copied to obj1
Console.WriteLine(obj1.param1 +" to " + obj1.param2);
Console.ReadLine();
}
}
}
When we run above program it will show output like as shown below

Output


Welcome to Dotnet - world


Static Constructor

When we declared constructor as static it will be invoked only once for any number of instances of the class and it’s during the creation of first instance of the class or the first reference to a static member in the class. Static constructor is used to initialize static fields of the class and to write the code that needs to be executed only once.


using System;
namespace ConsoleApplication3
{
class Sample
{
public string param1, param2;
static Sample()
{
Console.WriteLine("Static Constructor");
}
public Sample()
{
param1 = "Sample";
param2 = "Instance Constructor";
}
}
class Program
{
static void Main(string[] args)
{
// Here Both Static and instance constructors are invoked for first instance
Sample obj=new Sample();
Console.WriteLine(obj.param1 + " " + obj.param2);
// Here only instance constructor will be invoked
Sample obj1 = new Sample();
Console.WriteLine(obj1.param1 +" " + obj1.param2);
Console.ReadLine();
}
}
}
When we run above program we will get output like as shown below

Output


Static Constructor
Sample Instance Constructor
Sample Instance Constructor
Importance points of static constructor

-      Static constructor will not accept any parameters because it is automatically called by CLR.
-      Static constructor will not have any access modifiers.
-      Static constructor will execute automatically whenever we create first instance of class
-      Only one static constructor will allowed.
Private Constructor

Private constructor is a special instance constructor used in a class that contains static member only. If a class has one or more private constructor and no public constructor then other classes is not allowed to create instance of this class this mean we can neither create the object of the class nor it can be inherit by other class. The main purpose of creating private constructor is used to restrict the class from being instantiated when it contains every member as static.


using System;
namespace ConsoleApplication3
{
public class Sample
{
public string param1, param2;
public Sample(string a,string b)
{
param1 = a;
param2 = b;
}
private Sample()  // Private Constructor Declaration
{
Console.WriteLine("Private Constructor with no prameters");
}
}
class Program
{
static void Main(string[] args)
{
// Here we don't have chance to create instace for private constructor
Sample obj = new Sample("Welcome","to Dotnet - world");
Console.WriteLine(obj.param1 +" " + obj.param2);
Console.ReadLine();
}
}
}

Output


Welcome to Dotnet - world
In above method we can create object of class with parameters will work fine. If create object of class without parameters it will not allow us create.


// it will works fine
Sample obj = new Sample("Welcome","to Dotnet - world");
// it will not work because of inaccessability
Sample obj=new Sample();
Important points of private constructor

-      One use of private construct is when we have only static member.
-      Once we provide a constructor that is either private or public or any, the compiler will not allow us to add public constructor without parameters to the class.
-      If we want to create object of class even if we have private constructors then we need to have public constructor along with private constructor

Subscribe to: Posts (Atom)