NetSuite Most Frequently Asked Latest VB.NET Interview Questions Answers
How Do You Do Multithreading Application In Vb ?
VB doesn't support multithreading.
[Its the fastest and an excellent application provided in VB.net. Due to which many operations can be done without any lapse of time. The system need not wait for an application or any task to get completed, rather it runs simultaneously.]
What Are The Types Of Threading Models In Vb.net ?
There are lot of threading model available, but we focus on Threading models that are common to win32based environments singleThreaded:There is only one thread with in the process,and it is doing all the work for the process.The process must wait for the current execution of the thread to complete before it can perform another action.
Apartment Threading (Single Threaded Apartment)Apartment threaded means there are multiple threads within the application. In single threaded apartment (STA) each thread is isolated in a separate apartment underneath the process. The process can have any number of apartments that share data through a proxy. The application defines when and for how long the thread in each apartment should execute. All requests are serialized through the Windows message queue such that only a single apartment is accessed at a time and thus only a single thread will be executing at any one time.
Free Threading (Multi Threaded Apartment)Free threaded applications were limited to programming languages such as C++ until the release of Microsoft .NET. The free threaded/Multi Threaded Apartment (MTA) model has a single apartment created underneath the process rather than multiple apartments. This single apartment holds multiple threads rather than just a single thread. No message queue is required because all of the threads are a part of the same apartment and can share data without a proxy.
The developer must provide thread synchronization as part of the code to ensure that threads do not simultaneously access the same resources.
What Are The Advantage In Vb.net And Different Between Vb And Vb.net
vb is not follow the oops concept. But vb.net follow the oops concept.
[Adv of VB.NET
vb is object based.vb.net is object oriented
vb use record set for database connection
vb.net use dataset for database connection]
[1. VB uses vb runtime while vb.net uses CLR
2. VB object based,vb.net is object oriented
3. VB Suports splash screen
4. VB Uses on error goto while vb.net uses Try.. Catch..Finally
5. vb.Net Supports inheritance]
What Is The Difference Between Web User Control And Web Custom Control?
web user control: where it predefined attribute functionality where it resides in control library
web custom control: where it is defined by user itself and store in a custom library
Web User Controls
1) Easy to Create
2) Limited support for consumers who use visual design tool
3) A seperate copy of the control is required in each application.
4)Cannot be added to toolbox in Visual Studio.
5) Good for Static Layout.
Web Custom Controls
1) Harder to Create
2) Full support for consumers
3) Only a single copy of the control is required in the GAC
4)Can be added
5) Good for Dynamic Layout.
What Is An Indexed Property?
you include the index parameter in the Property statement. In this example, the test_number parameter is the index for the Scores property.
Public Class Student
' The private array of scores.
Private m_Scores(9) As Integer
' The indexed Score property procedures.
Public Property Score(ByVal test_number As Integer) As _ Integer
Get
Return m_Scores(test_number)
End Get
Set(ByVal Value As Integer)
m_Scores(test_number) = Value
End Set
End Property
End Class
How Do You Rate Yourself In .net ?
Based on Framework understanding and OOPS Concepts,Use of Different Component Library.
What Is Intermediate Language In .net ?
.net supports CLS i. e. Common language type. its a microsoft’s feature to bring all languages near one roof. When You compile .net code it doesn't converted into binary language, it converted into IL (Intermediate Language) also known as MSIL. And from IL to binary language converted at run time, CLR manages this process. At the runtime also it not converts whole project at time to binary, only converts that part which is going to execute, this the performance of project increases. This IL can use any language which is member of that .net studio. The assemblies (ExE, DLL) are also in IL form. So u can use any EXE or DLL created in vb.net in c#.net also.[which converts native code into byte code i.e machine understandable code.]
Is Vb.net Object Oriented? What Are The Inheritances Does Vb.net Support ?
yes VB.NET ia an object oriented.Vb.net supports all inheritance
1)single inheritance
It means Single class inheriting to single child classes
2)multiple inheritance
multiple classess inherits to single classes
3)Multilevel Inheritance
Single class inherits to one class that class inheritd to single another class
4)Heirarichal inheritance
Single class inherits to Multiple classes
5)Hybrid Inheritance
Single class inherits to different classess and that classes inherits to one class.
Difference Between Vb Dll And Assemblies In .net ?
Assemblies can contain DLL and EXE both. Different versions of one DLL can be handled by assemblies. They overcome the DLL Hell problem. Assemblies Contain Manifest and Meta Data files. These are the separate files that describes the Assembly and its attributes. VB DLL is inprocess.DLL run with an exe where as DLL are not self executable.
we can reuse DLLs .DLL are not platform independent If we have more then one Versions of a DLL we can face DLL Hell Problem.
What Is Dll Hell?
1.Adding of a new virtual method to a class exported from a DLL can cause the following problems
-If class already has a virtual method B and we are adding a new one named A before it, then we are changing the table of virtual methods. Now the first virtual method in the table will be A but not B and the client program which calls B will fail without recompilation as the call of B will cause the call of A and this is another method which possibly has other parameters and return type.
-When a class doesn?t have virtual methods and none of its base classes have, then adding of a new virtual method to it or to its base class will cause adding of the pointer for the table of virtual methods. This will cause change in the class size. So the error will occur after a client program will allocate memory for the class (an amount of memory that was required before the class has been changed) and will try to modify some of the class' fields explicitly or implicitly. In this case, as the pointer to the table of virtual method is added to the beginning of the class, all addresses of the class fields are shifted and thus we will get an abnormal client program behavior or a runtime error.
-In case when a class has virtual methods or any of its parent classes has, we can’t add virtual methods to classes exported from the DLL if they participate in the inheritance. We can?t add virtual methods not only to the beginning of the class declaration but also to the end of it. The problem is in shifting in the table of virtual methods. Note that even if you add a new virtual method to the end of the class declaration then the child’s virtual methods will be shifted.
2.Adding of a new field (of any kind) to a class declaration can cause following problems
1.Adding of a new field to the end of a class causes class size to change as in the case of adding of a virtual method to a class that didn?t have any. The client program will allocate less memory than it is required for a new class and this will cause referencing to the memory out of the class scope.
2.Adding of a new field between existing ones is even worse. It will case all addresses of fields after the new one to be shifted and a client application will work with the incorrect addresses while working with the fields that are situated after the new field. We also have the problem as in the previous point here.
How Does You Call And Execute A Sp In .net?
Using command object we can execute a SP. Instead of sql query we have to pass the SP Name.
[command.connection =connectionstring
command.commandType=commandType.storedProcedure
command.commandtext="sp_name"
command.executenonquery()]
Why Datareader Is Useful?
Data reader is useful when we just want to acccess datas from the database not when we want to perform DML operations. and It is useful when we want to perform forward only reading of datas.It wont requires any large volume of resources in the Front end. [Datareader is read only or forward only. So it is very fast to fetch the data from database.]
Trace And Debug Belongs To Which Namespaces?
system.process.diagnostics.
What Is The Difference Between Clr & Cts?
CLR is the common language runtime. which is the feature makes the .net applications to run plantform independent langauge interoperability.
CTS Common type system is the part of the CLR which enable the Common Datatype system to All the .net languages.it also defines conventions to convert objects from one langauge to another
What Is Clr?
CLR means Common Language Runtime.It is Major component of the .NET frameworkIt provides number of benefits to the developers such as Exception handling,Security,Debugging and Versioning...
What Is The Root Namespace For All Types?
Imports system.
What Is The Relation Between Garbage Collector And Finalize And Destructor?
here the GC calls an object's FINALIZE method immediately before it collects an object that is no longer referred by the application.
GC doesn’t actually run finalize method when the GC finds a FINALIZE method it queues the obj up for the finalizer to execute the objects method[GC checks for those resources which are no longer used by the process. To release the memory from these resources and in order to regain the memory heap GC initiates destructors to destroy such instances of the program. Before the destructor void an instance variable finalize routine gets executed. This routine performs whatever is to be done before the object return to void state or prior to release of any unused resources.]
How Do You Do Multithreading Application In Vb ?
VB doesn't support multithreading.
[Its the fastest and an excellent application provided in VB.net. Due to which many operations can be done without any lapse of time. The system need not wait for an application or any task to get completed, rather it runs simultaneously.]
What Are The Types Of Threading Models In Vb.net ?
There are lot of threading model available, but we focus on Threading models that are common to win32based environments singleThreaded:There is only one thread with in the process,and it is doing all the work for the process.The process must wait for the current execution of the thread to complete before it can perform another action.
Apartment Threading (Single Threaded Apartment)Apartment threaded means there are multiple threads within the application. In single threaded apartment (STA) each thread is isolated in a separate apartment underneath the process. The process can have any number of apartments that share data through a proxy. The application defines when and for how long the thread in each apartment should execute. All requests are serialized through the Windows message queue such that only a single apartment is accessed at a time and thus only a single thread will be executing at any one time.
Free Threading (Multi Threaded Apartment)Free threaded applications were limited to programming languages such as C++ until the release of Microsoft .NET. The free threaded/Multi Threaded Apartment (MTA) model has a single apartment created underneath the process rather than multiple apartments. This single apartment holds multiple threads rather than just a single thread. No message queue is required because all of the threads are a part of the same apartment and can share data without a proxy.
The developer must provide thread synchronization as part of the code to ensure that threads do not simultaneously access the same resources.
What Are The Advantage In Vb.net And Different Between Vb And Vb.net
vb is not follow the oops concept. But vb.net follow the oops concept.
[Adv of VB.NET
vb is object based.vb.net is object oriented
vb use record set for database connection
vb.net use dataset for database connection]
[1. VB uses vb runtime while vb.net uses CLR
2. VB object based,vb.net is object oriented
3. VB Suports splash screen
4. VB Uses on error goto while vb.net uses Try.. Catch..Finally
5. vb.Net Supports inheritance]
 |
| NetSuite Most Frequently Asked Latest VB.NET Interview Questions Answers |
What Is The Difference Between Web User Control And Web Custom Control?
web user control: where it predefined attribute functionality where it resides in control library
web custom control: where it is defined by user itself and store in a custom library
Web User Controls
1) Easy to Create
2) Limited support for consumers who use visual design tool
3) A seperate copy of the control is required in each application.
4)Cannot be added to toolbox in Visual Studio.
5) Good for Static Layout.
Web Custom Controls
1) Harder to Create
2) Full support for consumers
3) Only a single copy of the control is required in the GAC
4)Can be added
5) Good for Dynamic Layout.
What Is An Indexed Property?
you include the index parameter in the Property statement. In this example, the test_number parameter is the index for the Scores property.
Public Class Student
' The private array of scores.
Private m_Scores(9) As Integer
' The indexed Score property procedures.
Public Property Score(ByVal test_number As Integer) As _ Integer
Get
Return m_Scores(test_number)
End Get
Set(ByVal Value As Integer)
m_Scores(test_number) = Value
End Set
End Property
End Class
How Do You Rate Yourself In .net ?
Based on Framework understanding and OOPS Concepts,Use of Different Component Library.
What Is Intermediate Language In .net ?
.net supports CLS i. e. Common language type. its a microsoft’s feature to bring all languages near one roof. When You compile .net code it doesn't converted into binary language, it converted into IL (Intermediate Language) also known as MSIL. And from IL to binary language converted at run time, CLR manages this process. At the runtime also it not converts whole project at time to binary, only converts that part which is going to execute, this the performance of project increases. This IL can use any language which is member of that .net studio. The assemblies (ExE, DLL) are also in IL form. So u can use any EXE or DLL created in vb.net in c#.net also.[which converts native code into byte code i.e machine understandable code.]
Is Vb.net Object Oriented? What Are The Inheritances Does Vb.net Support ?
yes VB.NET ia an object oriented.Vb.net supports all inheritance
1)single inheritance
It means Single class inheriting to single child classes
2)multiple inheritance
multiple classess inherits to single classes
3)Multilevel Inheritance
Single class inherits to one class that class inheritd to single another class
4)Heirarichal inheritance
Single class inherits to Multiple classes
5)Hybrid Inheritance
Single class inherits to different classess and that classes inherits to one class.
Difference Between Vb Dll And Assemblies In .net ?
Assemblies can contain DLL and EXE both. Different versions of one DLL can be handled by assemblies. They overcome the DLL Hell problem. Assemblies Contain Manifest and Meta Data files. These are the separate files that describes the Assembly and its attributes. VB DLL is inprocess.DLL run with an exe where as DLL are not self executable.
we can reuse DLLs .DLL are not platform independent If we have more then one Versions of a DLL we can face DLL Hell Problem.
1.Adding of a new virtual method to a class exported from a DLL can cause the following problems
-If class already has a virtual method B and we are adding a new one named A before it, then we are changing the table of virtual methods. Now the first virtual method in the table will be A but not B and the client program which calls B will fail without recompilation as the call of B will cause the call of A and this is another method which possibly has other parameters and return type.
-When a class doesn?t have virtual methods and none of its base classes have, then adding of a new virtual method to it or to its base class will cause adding of the pointer for the table of virtual methods. This will cause change in the class size. So the error will occur after a client program will allocate memory for the class (an amount of memory that was required before the class has been changed) and will try to modify some of the class' fields explicitly or implicitly. In this case, as the pointer to the table of virtual method is added to the beginning of the class, all addresses of the class fields are shifted and thus we will get an abnormal client program behavior or a runtime error.
-In case when a class has virtual methods or any of its parent classes has, we can’t add virtual methods to classes exported from the DLL if they participate in the inheritance. We can?t add virtual methods not only to the beginning of the class declaration but also to the end of it. The problem is in shifting in the table of virtual methods. Note that even if you add a new virtual method to the end of the class declaration then the child’s virtual methods will be shifted.
2.Adding of a new field (of any kind) to a class declaration can cause following problems
1.Adding of a new field to the end of a class causes class size to change as in the case of adding of a virtual method to a class that didn?t have any. The client program will allocate less memory than it is required for a new class and this will cause referencing to the memory out of the class scope.
2.Adding of a new field between existing ones is even worse. It will case all addresses of fields after the new one to be shifted and a client application will work with the incorrect addresses while working with the fields that are situated after the new field. We also have the problem as in the previous point here.
How Does You Call And Execute A Sp In .net?
Using command object we can execute a SP. Instead of sql query we have to pass the SP Name.
[command.connection =connectionstring
command.commandType=commandType.storedProcedure
command.commandtext="sp_name"
command.executenonquery()]
Why Datareader Is Useful?
Data reader is useful when we just want to acccess datas from the database not when we want to perform DML operations. and It is useful when we want to perform forward only reading of datas.It wont requires any large volume of resources in the Front end. [Datareader is read only or forward only. So it is very fast to fetch the data from database.]
Trace And Debug Belongs To Which Namespaces?
system.process.diagnostics.
What Is The Difference Between Clr & Cts?
CLR is the common language runtime. which is the feature makes the .net applications to run plantform independent langauge interoperability.
CTS Common type system is the part of the CLR which enable the Common Datatype system to All the .net languages.it also defines conventions to convert objects from one langauge to another
What Is Clr?
CLR means Common Language Runtime.It is Major component of the .NET frameworkIt provides number of benefits to the developers such as Exception handling,Security,Debugging and Versioning...
What Is The Root Namespace For All Types?
Imports system.
What Is The Relation Between Garbage Collector And Finalize And Destructor?
here the GC calls an object's FINALIZE method immediately before it collects an object that is no longer referred by the application.
GC doesn’t actually run finalize method when the GC finds a FINALIZE method it queues the obj up for the finalizer to execute the objects method[GC checks for those resources which are no longer used by the process. To release the memory from these resources and in order to regain the memory heap GC initiates destructors to destroy such instances of the program. Before the destructor void an instance variable finalize routine gets executed. This routine performs whatever is to be done before the object return to void state or prior to release of any unused resources.]
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