Question:-Can you define what is Jagged Array in VB.NET ?
Answer: Jagged array is multidimensional array.If jagged array is two dimensinal it also contain a table where each row can have a different number of columns.
A jagged array is really an array of arrays. To create a jagged array, you declare the array of arrays with multiple sets of parentheses or brackets and indicate the size of the jagged array in the first set of brackets.

Question:-What is DataType conversion in VB.NET ?
Answer: Convert one variable type to another one is called datatype conversion we can also caleed this casting in VB.NET some automatically conversion is also there.
Cbool CByte CChar Cdate CDec CDbl CInt CLng CObj CShort CSng CStr CType Asc.
Question:-What do u mean by Redim in VB.NET ?
Answer: In vb.net we use Redim and erase to manipulate Array. Once we declare an array the size set to array its makes limited to that range but with the help of redim we used to change the array size.
Redim arr(6)
we can also used preserve to save these values.
Redim Preserve arr(6)

Question:- What is branching logic control in vb.net ?
Answer: Function and subroutines are the answer.The diffrence in two of them is function send information back from where it is called means function can return a value but subroutines can not do this.

Question:-Write the role of New keyword ?
Answer: New is used to initialize a new object. We sets a variable to any dattype with help of New keyword .The New keyword gives a value to the variable.We can also uses new keyword to initialize an object variable.
Example:- dim obj as new SqlDataAdapter.

Question: What is diffrenet between import System.Data.SqlClient,System.Data.Oledb ?
Answer: System.Data.OleDB It contains the objects that we use to connect to a data source via an OleDB provider , such as OleDbConnection, OleDBCOmmand. System.Data.SqlClient It contains objects that we use to connect to a data source via Tabular data stream interface provided by Microsoft Sql Server. This can be generally used to provide better performance because it removes some of the intermediate layers required by the OleDB provider.

Question: What is the difference between DataTable and DataSet
Answer: Dataset: Represents an in-memory cache of data we can also say data set is a collection of data table it is based on xml format ,it is used for data storing in cache as a disconnected recordset dataset is using data manipulation in cache wthout connection to database. DataTable: Represents one table of in-memory data data table can have one table only or we can say Data table is a collection of record’s that consist the single table

Question: What is the difference between VB and VB.NET ?
Answer: Object-based language and Does not support inheritance also ADO.Net does not give support for disconnected data architecture and there is No interoperability function and No support for threading. On the other hand VB.NET is Object-Oriented Programming language and ADO.Net gives support for disconnected data architecture also provides interoperability and Its uses managed code and supports threading also provides access to third-party controls like COM, DCOM

Question:-What is Serialization Formatters in .NET Remoting ?
Answer: When any object is to be sent across the transport channel, it must be serialized and packed into a data format that can be transmitted with the wire. On the other end of the wire, this serialized data is read and deserialized back to the actual object. This Serialization is done by message-serialization formatters which convert the field or object’s state into a format that is helpful for storage or transmission. Dot Net framework provides us two message-serialization formatters one of them is a binary serialization formatter which converts an object’s state into a binary stream and other is SOAP serialization formatter which converts it into an XML string representation that’s human readable. The binary serialization formatter much slightly faster.

Question:-What is Channels ?
Answer: Remote objects are accessed through Channels. Channels physically transport the messages to and from remote objects. There are two existing channels TcpChannel and HttpChannel. Their names give away the protocols that they use. In addition, the TcpChannel or HttpChannel can be extended, or a new channel created if you determine the existing channels do not meet your needs.

.NET Remoting eliminates the difficulties of DCOM by supporting different transport protocol formats and communication protocols. This allows .NET Remoting to be adaptable to the network environment in which it is being used.
Question:- Security in Remoting ?
Answer: Security is of paramount importance to any distributed application. Although the .NET Remoting infrastructure does not define any security features itself, because distributed applications are managed code they have full access to all of the .NET security features. In addition, the HTTP channel, when used with IIS, allows you to take full advantage of the authentication and authorization features that are available to Web based protocols. If you choose to use a protocol other than HTTP with IIS, then you have the opportunity to create your own security infrastructure.

Question:-Advantage of Remoting over Web Services ?
Answer: .NET Remoting is a distributed objects infrastructure. It allows processes to share objects—to call methods on and access properties of objects that are hosted in different application domains within the same process, different processes executing on the same computer, on computers on an intranet, or on computers distributed over wide areas. .NET Remoting supports many different communications protocols, including the SOAP/HTTP protocol used by ASP.NET Web services. Support for other protocols makes it possible to provide much faster communications in .NET Remoting than would be possible with ASP.NET Web services. The ASP.NET programming model is tied specifically to IIS, and is limited to creating Web services that use the producer/consumer model. .NET Remoting, on the other hand, can share objects from any type of application.

Question:- Scope of publication ?
Answer: .NET Remoting exposes objects to other application domains as if they are local, with a few exceptions. The two exceptions most likely to trip you up are:
• Static members are never remoted. Remoting always deals with some form of object instance member.
• Private methods are never remoted. You cannot wrap and pass a delegate to a private method. This includes remote event handlers.
The other exceptions are less likely to cause you trouble. The online documentation provides a complete list and explanation of the exceptions.

Question:-What are the Proxies ?
Answer: In the general sense, a proxy is any object that stands in for another, either servicing requests directly or passing the requests on to the object for which it is standing in. In .NET Remoting, the proxy manages the marshaling process and the other tasks required to make cross-boundary calls. The .NET Remoting infrastructure automatically handles creation and management of proxies, although it is possible to create your own proxy classes to plug in to and customize proxy creation, marshaling, and other proxy-related tasks.

Question:-What is Abstract ?
Answer: .NET Remoting provides a powerful and high performance way of working with remote objects. Architecturally, .NET Remote objects are a perfect fit for accessing resources across the network without the overhead posed by SOAP based WebServices. .NET Remoting is easier to use than Java’s RMI, but definately more difficult than creating a WebService.

Question:-Some Important Notes
Answer: The dependence on assembly metadata implies that client applications must understand .NET concepts. As a result, applications that make use of .NET Remoting are not interoperable with other systems. Although it’s possible to write an XML Web service using .NET Remoting, it’s not practical when you consider that ASP.NET is designed specifically for that task. In most cases, in order to use .NET Remoting, both the client and the server must be .NET applications. This makes .NET Remoting a poor choice if you want non-.NET clients to access your service.

Before we get into the nuts and bolts of how Remoting works and how to write programs that take advantage of it, you need to understand some basic Remoting concepts.
Question:-.NET Remoting Overview ?
Answer: .NET Remoting is very flexible. You have a wide range of communications options and activation methods, as well as full control over a distributed object’s lifecycle. You can choose TCP or HTTP communications protocols on any port, using text or binary formatting. The .NET Remoting infrastructure supports server activated (single call and singleton) and client activated objects. .NET Remoting gives you many opportunities to “plug in” to the system to customize lifecycle management, marshaling, serialization, messaging, and other services.

Question:-Can it is possible to  use COM objects from a .NET Framework program ?
Answer: :- I think yes  COM component which we  have deployed today can be used from managed code, and in common cases the its adopt automatic. To  access com component  from the .NET Framework we  use  runtime callable wrapper (RCW). This wrapper turns the COM interfaces exposed by the COM component into .NET Framework-compatible interfaces. For OLE automation interfaces, the RCW can be generated automatically from a type library. But for non-OLE automation interfaces, a developer may have to  write a custom RCW and then manually map  types that is exposed by the COM interface to .NET Framework-compatible types.

Question:-What is Monikers when using COM ?
Answer: Clients always require a easy way to reconnect the same process where he is on last time or we can say that exact same state at a later point in time. This support is provided via “monikers”. A moniker is a COM object that helps in this task because its knows how to create and initialize the content of a single COM object instance. A moniker can be asked to bind to the COM object it showing, so a COM object on specific machine on the network, or a group of cells inside a spreadsheet.

Question:-Explain Transaction with COM+ Components?
Answer: Transaction consists of group of task bind in a single execution unit .When a transaction starts with specific task it is completed when all the statement in units are completed if any one produce error it will Rollback.So transaction have only two result Success and failure.
On the other hand COM+ components need code to transaction.Because it will automatically participate in transaction.Its not require any explicit code to specify the start and end of transaction.when we create an object of COM+ it is activated with BeginTransaction with COM+ services provides.And this object is deactivated using CommitTransaction or AbortTransaction method.

Question:-How COM+ Component adopt security?
Answer: To reduce complexity COM+ used or provides role-based security service that’s helps in middle-tier components.There are two types of role-based security.
(1)Declaractive
(2)Programmatic
When we applied and configure security without using an explicit programming interface is known as declartive security settings. On the other hand there are some situation when work load is heavy and secuirty is must and exchange of data accross the network and security measure should be taken with programming interface and it is known as programmactic secrity.

Question:-How do you generate an RCW from a COM object?
Answer: Use the Type Library Import utility shipped with SDK. tlbimp COMobject.dll /out:.NETobject.dll or reference the COM library from Visual Studio in your project.

Question: What do u mean by Function Overloading ?
Answer: When more than one function is created with the same name, but different is of there arguments . In other words, function names can be overloaded. A function may also have the same name as an attribute. In the case that there is an ambiguity between a function on a complex type and an attribute of the complex type, the attribute will always be used.
Question: What Is OOPS ?
Answer: OOPs is an Object Oriented Programming language,which is the extension of Procedure Oriented Programming language.OOPS reduce the code of the program because of the extensive feature of Polymorphism. OOPS have many properties such as Data-Hiding,Inheritence,Data Absraction,Data Encapsulation and many moreEverything in the world is an object. The type of the object may vary. In OOPS, we get the power to create objects of our own, as & when required.

Question: what is Class ?
Answer:A group of objects that share a common definition and that therefore share common properties, operations, and behavior. A user-defined type that is defined with the class-key ‘class,’ ’struct,’ or ‘union.’ Objects of a class type consist of zero or more members and base class objects.Classes can be defined hierarchically, allowing one class to be an expansion of another, and classes can restrict access to their members.
Question: What is Constructor?
Answer:When we create instance of class a special method of that class, called that is constructor. Similarly, when the class is destroyed, the destructor method is called. These are general terms and usually not the actual member names in most object-oriented languages. It is initialized using the keyword New, and is destroyed using the keyword Finalize.

Question: What is Abstract Class ?
Answer:Classes that cannot be instantiated. We cannot create an object from such a class for use in our program. We can use an abstract class as a base class, creating new classes that will inherit from it. Creating an abstract class with a certain minimum required level of functionality gives us a defined starting point from which we can derive non-abstract classes. An abstract class may contain abstract methods & non-abstract methods. When a class is derived from an abstract class, the derived class must implement all the abstract methods declared in the base class. We may use accessibility modifiers in an abstract class.An abstract class can inherit from a non-abstract class. In C++, this concept is known as pure virtual method.

Question: What is ValueType?
Answer:Value Types - Value types are primitive types. Like Int32 maps to System.Int32, double maps to System.double.All value types are stored on stack and all the value types are derived from System.ValueType. All structures and enumerated types that are derived from System.ValueType are created on stack, hence known as ValueType.In value type we create a copy of object and uses there value its not the original one.

Question: What is diff. between abstract class and an interface?
Answer: An abstract class and Interface both have method only but not have body of method.The difference between Abstract class and An Interface is that if u call Ablstract class then u have to call all method of that particular Abstract class but if u call an Interface then it is not necessary that u call all method of that particular interface.Method OverLoading:-Return type, Parameter type, parameter and body of method number may be different.Method Overriding:- Return type, Parameter type, Parameter Number all must be same . Only body of method can change.