Vb.net interview questions with answers in pdf

The process of transitively tracing through all pointers to actively used objects in order to locate all objects that can be referenced, and then arranging to reuse any heap memory that was not found during this trace. The common language runtime garbage collector also compacts the memory that is in use to reduce the working space needed for the heap.

What is the difference between the value-type variables and reference-type variables in terms of garbage collection? The value-type variables are not garbage-collected, they just fall off the stack when they fall out of scope, the reference-type objects are picked up by GC when their references go null. Error Report! Toggle navigation. ANSI is nothing but an American national standards institute that is responsible to name the external procedure being declared.

Ans: The object-oriented program offers a way to modularizing by creating a partitioned functional memory area. And also can be used as a data template for creating copies of such functional memory area. Object-oriented programming allows the decomposition of the problems into numerous data entities they called Objects.

Then they built numerous data and functions around the objects. Ans: The static variable indicates the retain values, even after the termination of the programming procedure. This can be done only when they are declared in the program. Ans: Garbage collection in Vb. Net is primarily used for memory management. They are also used to allocate and release memory to your applications. This garbage collector checks for the data objects in the heap management where they are no longer being used by the user application when it performs garbage collection operation.

Ans: The assembly keyword in the Vb. Net framework specifies the attributes at the beginning of a source file which applies to the entire functional assembly.

Ans:The friend keyword is used to declare the statement which specifies the elements within the same functional assembly. Then it can be used only at the class level but not at the source file level or any Namespace or inside within Interfaces, Module, Structure, or Procedure. Ans:The ByRef in Vb. Net specifies the arguments which are passed by references. In brief, we can call them a procedure that can change the value of the data variable in the calling code methods. This is also used under the context of the following statement:.

Ans: The following are the important keywords used in Vb. Net framework;. Ans: A framework is nothing but a layered structure that indicates the programming type that can or should be built. Also explains how they will inter-relate and also includes the actual programs, specifies the computer programming interfaces. The framework also contains tools that are used by the user during the time of developing codes. This is also considered as a conceptual structure or a scheme with an intension to support the development of some data structures.

Net represents the Microsoft Intermediate languages. This is similar to Java byte code. Ans: Every assembly in Vb. Net contains an Assembly manifest techniques. It includes the following features such as;. Ans: A constructor in Vb. Net is a special member data function or a method whose task is mainly to initialize the objects of the class. The constructor's name is the same as its class name. The name is given as a constructor because it constructs the values for the data members function in a class.

The user invokes the constructor when the object of the associated class is created. Ans: The class holds the entire data set and code of an object which can be made user-defined data types. Objects are the variables of Class type. Once you define the class, you can create the numerous data objects of its class type.

A class is simply a collection of data objects of similar data types. Ans: Array list in Vb. Net represents the ordered collection of an object which can be indexed individually. This is an alternative to the array. Unlike an array, the user can add or remove the data items from a list at the specified position using the Index and the array resize. This also allows allocates the dynamic memory allocation, adding, searching, and sorting the items in the data list.

Ans: There are 4 types of data validation available in Vb. Ans: The functions in Vb. Net can help the function to send information back to where it has been called from. The only difference with Sub Routines is that it cannot return values. Ans: There are 6 different types of dialog boxes used in Windows forms such as;.

Net Interview Questions. Become a Certified Professional. What is the Vb. Net framework? What is the entry methods used in Vb. Ans: Sub Main command indicates the entry point in the Vb.

Net program. It means handling versioning and deploying applications is easier in VB. NET than in VB6. NET which is comparatively more efficient and also supports the disconnected data access. We cannot create multithreaded applications in VB6. In VB. NET, we can create multi threaded applications. It is a layer of the. Provides various services required in execution of an application such as memory management, garbage collection, thread management, exception handling, security checks etc.

It is a formal specification that documents how types are declared, used and managed in order to be used by the CLR. CTS ensure that the data types of objects written in various languages are able to interact with each other. It also defines the rules to ensure that objects written in different languages can interact with each other.

Common Type System supports following types:. Value types — value types directly contain their data. Instances of value types are either allocated on the stack or allocated inline in a structure.

Value types can be built-in, user-defined, or enumerations. Examples of reference types include arrays, pointer typ. Error Report! Toggle navigation. Question: 1 How many languages.

NET is supporting now?