Interview Q&A

• What is Diffgram in ADO.NET? When do we use Diffgram?

  A DiffGram is an XML format. It is used to identify current and original versions of data elements. A DataSet may use a DiffGram format to load and persist the contents, and further to serialize its contents for porting across a network con...

• What is the main difference between ADO and ADO.Net

  ADO was a connected data access model, which means that when a connection to the database is made, the connection remains open until the application is closed. ADO.NET is disconnected database access model, which means when an applica...

• What is DataRelation object in ADO.NET? How to use a DataRelation between two columns in ADO.NET?

  n order to set the relationship between two or more than two columns, ADO.NET provides the DataRelation class. When a DataRelation object is created, it assists to enforce some constraints on the relationships between columns. The constrain...

• What is a DataView in ADO.NET?

  DataView - Just like we have Views in SQL (in our backend), we have DataView object in ADO.NET. A dataview object represents bindable, customized view of a DataTable object. Operations like Sorting, Filtering, Searching, Editing and Navigat...

• What are the Different layers in ADO.Net?

  1.Property layer 2.Business logic layer 3.Data accress layer

• What is a SqlCommandBuilder in ADO.NET

  SqlCommandBuilder class in ADO.NET provides the feature of reflecting the changes made to a DataSet or an instance of the SQL server data. When an instance of the SqlCommandBuilder class is created, it automatically generates Transact-SQL s...

• What is a command object in ADO.NET. How to use a command object in .NET?

  ADO.NET Command Object - The Command object is similar to the old ADO command object. It is used to store SQL statements that need to be executed against a data source. The Command object can execute SELECT statements, INSERT, UPDATE, or DE...

• What is a connection object in ADO.NET? How to connect to a database in .Net?

  A Connection object in ADO.NET is used to establish a connection between a program (the program may be a windows page, a web page, a windows service, a web service etc.) and the database. The connection is open just long enough to get or up...

• What is ADO.NET?

  ADO.NET is a part of the Microsoft .NET Framework. This framework provides the set of classes that deal with data communication between various layers of the software architecture and the database. It provides a continious access to differe...

• Is it possible to have different access modifiers on the get/set methods of a property?

  No. The access modifier on a property applies to both its get and set accessors. What you need to do if you want them to be different is make the property read-only (by only providing a get accessor) and create a private/internal set method...

• How do you generate documentation from the C# file commented properly with a command-line compiler?

  Compile it with a /doc switch.

• What’s a delegate?

  A delegate object encapsulates a reference to a method.

• What’s the difference between an interface and abstract class?

  In an interface class, all methods are abstract - there is no implementation. In an abstract class some methods can be concrete. In an interface class, no accessibility modifiers are allowed. An abstract class may have accessibility modi...

• What’s a multicast delegate?

  It’s a delegate that points to and eventually fires off several methods

• What’s the difference between the System.Array.CopyTo() and System.Array.Clone()?

  The Clone() method returns a new array (a shallow copy) object containing all the elements in the original array. The CopyTo() method copies the elements into another existing array. Both perform a shallow copy. A shallow copy means the...

• What’s the advantage of using System.Text.StringBuilder over System.String?

  StringBuilder is more efficient in cases where there is a large amount of string manipulation. Strings are immutable, so each time a string is changed, a new instance in memory is created.

• What’s the difference between System.String and System.Text.StringBuilder classes?

  System.String is immutable. System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed.

• 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.

• Explain about the keyword Must Inherit?

  This keyword prevents a class from directly instantiated. This keyword forces users to create references to only derived classes.

• Name and explain some of the exclusive features which are present in VB?

  Some of the features which are exclusive to VB are as follows: - 1) Name space can be hidden which can be disabled. 2) Certain project files can be hidden and a user can show them if he intends to do. 3) Lots and lots of shortcuts are pr...

• Explain about Visual basic.NET culture?

  VB was always a RAD tool and it was always user friendly for any type of user whether professional or not. It also provided many users with shortcuts and features which made this language popular among many users. It had its share of debugg...

• Compare C# and Visual basic.NET?

  .NET Frame work includes two languages which are language to IL compilers and in this C# and VB.NET are provided. The importance and flexibility of these as better programming languages is still questionable. Visual basic has been updated a...

• Explain about the performance of Visual basic?

  Visual basic 5 and 6 are efficient in coding the code to native or P-code depending upon the programmer. Portability is a major addition to the performance of VB.NET and the code is also small. Additional layer is provided which interprets...

• What are the various open source tool available for VB.NET?

  When compared with the rapid development of open source tools for other languages from Microsoft (C#, etc) we can say that development of tools for VB has been slow. Mono development platform is one which is implementing VB libraries and is...

• Describe about Visual basic.NET?

  This is used in conjunction with Microsoft .NET platform and is a successor to visual basic sixth version. Visual basic is used in conjunction with.NET Framework. This tool has a serious defect it is not compatible with Microsoft visual bas...

• Explain and brief about rapid application development tool?

  Rapid action development tool describes about the software development process. This tool gives flexibility in iterative development and prototype deployment. It enhances the speed of application development. It is also used for application...

• Name some of the features present in VB 2005?

  Some of the features present in VB 2005 are as follows: - • Edit and continue: - It allows developers to modify and execute applications almost simultaneously. • Namespace: - This provides access to various parts of the .NET framework and...

• Explain about .NET?

  .NET is a Microsoft Framework and a software component. .NET has a large library of pre-coded solutions which provided developer significant help in developing applications with solutions already present. It offers reliable security and cro...

• Explain about visual basic?

  Visual basic is associated with the IDE of Microsoft. It is basically useful to implement RAD of GUI. Creation of Active X scripts are very easy and efficient through VB. Windows API can also be used to create application on windows desktop...

• What do you mean by three-tier architecture?

  he three-tier architecture was comes into existence to improve management of code and contents and to improve the performance of the web based applications.There are mainly three layers in three-tier architecture.the are define as follows...

• What is different between WebUserControl and in WebCustomControl ?

  Web user controls :- Web User Control is Easier to create and another thing is that its support is limited for users who use a visual design tool one gud thing is that its contains static layout one more thing a seprate copy is required for...

• How Visual SourceSafe helps Us ?

  One of the powerful tool provided by Microsoft to keep up-to-date of files system its keeps records of file history once we add files to source safe it can be add to database and the changes ade by diffrenet user to this files are maintaine...

• What is main difference between GridLayout and FormLayout ?

  GridLayout helps in providing absolute positioning of every control placed on the page.It is easier to devlop page with absolute positioning because control can be placed any where according to our requirement.But FormLayout is little diffe...

• What is cross page posting in ASP.NET2.0 ?

  When we have to post data from one page to another in application we used server.transfer method but in this the URL remains the same but in cross page posting there is little different there is normal post back is done but in target page w...

• What do you mean by Share Point Portal ?

  Here I have taken information regarding Share Point Portal Server 2003 provides mainly access to the crucial business information and applications.With the help of Share Point Server we can server information between Public Folders, Data...

• What is the purpose of IIS ?

  We can call IIS(Internet Information Services) a powerful Web server that helps us creating highly reliable, scalable and manageable infrastructure for Web application which runs on Windows Server 2003. IIS helps development center and incr...

• Does the .NET Framework have in-built support for serialization?

  There are two separate mechanisms provided by the .NET class library - XmlSerializer and SoapFormatter/BinaryFormatter. Microsoft uses XmlSerializer for Web Services, and uses SoapFormatter/BinaryFormatter for remoting. Both are available f...

• How do assemblies find each other?

  By searching directory paths. There are several factors which can affect the path (such as the AppDomain host, and application configuration files), but for private assemblies the search path is normally the application's directory and its...

• What does assert() method do?

  In debug compilation, assert takes in a Boolean condition as a parameter, and shows the error dialog if the condition is false. The program proceeds without any interruption if the condition is true.

• Why string are called Immutable data Type ?

  The memory representation of string is an Array of Characters, So on re-assigning the new array of Char is formed & the start address is changed . Thus keeping the Old string in Memory for Garbage Collector to be disposed.

• What is reflection?

  All .NET compilers produce metadata about the types defined in the modules they produce. This metadata is packaged along with the module (modules in turn are packaged together in assemblies), and can be accessed by a mechanism called reflec...

• What is IL?

  IL = Intermediate Language. Also known as MSIL (Microsoft Intermediate Language) or CIL (Common Intermediate Language). All .NET source code (of any language) is compiled to IL. The IL is then converted to machine code at the point where th...

• What is the CLS?

  CLS = Common Language Specification. This is a subset of the CTS which all .NET languages are expected to support. The idea is that any program which uses CLS-compliant types can interoperate with any .NET program written in any language....

• What is the CTS?

  CTS = Common Type System. This is the range of types that the .NET runtime understands, and therefore that .NET applications can use. However note that not all .NET languages will support all the types in the CTS. The CTS is a superset of t...

• What is the CLR?

  CLR = Common Language Runtime. The CLR is a set of standard resources that (in theory) any .NET program can take advantage of, regardless of programming language.

• What platforms does the .NET Framework run on?

  The runtime supports Windows XP, Windows 2000, NT4 SP6a and Windows ME/98. Windows 95 is not supported. Some parts of the framework do not work on all platforms - for example, ASP.NET is only supported on Windows XP and Windows 2000. Window...

• What is ADO?

  ADO are meant to eliminate the need to convert existing data from one proprietary format to another.

• What is ActiveX control?

  ActiveX are software component based on Microsoft's component based technology(COM).ActiveX controls were originally called "OLE controls" and used an .OCX file extension. They were Microsoft's second-generation component architectu...

• What is an ActiveX method?

  A method is an exposed function that can be applied to a control via the IDispatch interface.

• What is an ActiveX interface?

  An ActiveX interface is a group of related functions that are grouped together