General

Question 1

What is an algorithm?

Answer 1

A logical series of steps that solve a problem

Question 2

What is an in-process component?

Answer 2

is implemented as a DLL
runs in the same process space as its client enabling the most efficient communication between client and component.
Each client app that uses the component starts a new instance of it

Question 3

What is an out-process component?

Answer 3

An out of process component is implemented as an EXE
runs in its own process space.
Exe’s are slower then dll’s because
communications between client and component must be marshalled across process boundaries

Question 4

What are the main components of the ADO object model?

Answer 4

Used to make a connection between your app and an external data source, ie, sql server
Used to build queries, including user-specific parameters, to access records from a data source

Question 5

Why we use Treeview Control?

Answer 5

To list the hierarchical list of the node objects. Such of files and Directories.

Question 6

What are the different types of error?

Answer 6

Syntax Errors, Runtime , Logic

Question 7

why are collections better than arrays?

Answer 7

1. A collection objects uses less Memory than an array.
2. It provides methods to add and delete members.
3. It does not required reason statement when objects are added or deleted.
4. It does not have boundary limitations.

Question 8

what is set value?

Answer 8

Set Value is assigned to ActiveX Object from the form.

Question 9

what is let value?

Answer 9

Let Value is retried to ActiveX Object from the form.

Question 10

what is get value?

Answer 10

Get- Assigns the value of an expression to a variable or property.

Question 11

what are the Different type of Instantiation?

Answer 11

Private Only for the Specific Module.
Public not creatable Private & Public
Multi Use - Variable we have to declare.
Single Use Not possible through dll.
Global Multiuse Have variable not Required to Declare.
Global Single Use - Only for exe.

Question 12

What is the diff. Between function and sub procedures??

Answer 12

Function will return value but a sub procedure wont return values

Question 13

What is difference between datagrid and flexgrid?

Answer 13

Datagrid Editable. Flexigrid Non-Editable. (Generally used for Read only purpose.)

Question 14

What is the diff between the Create Object and Get object?

Answer 14

Create Object - To create an instance of an object.

Get Object To get the reference to an existing object.

Question 15

What are types of binding?

Answer 15

Early Binding -Memory size is allotted while declaring itself. New Key word is important.
Late Binding - Memory size is allotted in later stage.

Question 16

What is ADO?

Answer 16

ActiveX Data Object

Question 17

Different type of Passing Value?

Answer 17

By value, By ref, Optional, Param Array

Question 18

what is a class?

Answer 18

A class describes the variables, properties, procedures, and events of an object.

Question 19

what is an object?

Answer 19

An object is a combination of code and data that can be treated as a unit

Question 20

what is a base class?

Answer 20

A base class (inheritance) defines BOTH the code and the names of methods and properties.

Question 21

What is an abstract class

Answer 21

An abstract class implements NO CODE it only defines the name of methods and properties

Question 22

what is a static variable

Answer 22

A static variable continues to exist and retains its most recent value. 
The variable is not reinitialized
still holds the latest value that you assigned to it. 
A static variable continues to exist for the lifetime of the class or module that it is defined in

Question 23

what is binary compatibility?

Answer 23

Setting Binary Compatibility makes VB keep all Class and Interface Ids

Question 24

what breaks binary compatibility?

Answer 24

changes that would alter the interface

Question 25

what is ok to do once binary compatibility has been set?

Answer 25

add methods

Question 26

What is COM?

Answer 26

component object model

Question 27

what is instantiating a class?

Answer 27

creating an instance of an object

Question 28

when would you use a combo box?

Answer 28

when you need to display a drop-down list with many items

Question 29

what is a list box

Answer 29

displays the items all at once in a text area

Question 30

what are ocx files

Answer 30

a type of dll

Question 31

what is OLE?

Answer 31

Object Linking and Embedding

Question 32

what is an array?

Answer 32

An array is a consecutive group of memory locations that all have the same name and the same type. To refer to a particular location or element in the array, we specify the array name and the array element position number