Visual Studio Form

Question 1

What is FCL?

Answer 1

The Framework class library (FCL) is a comprehensive collection of reusable types including classes, interfaces and data types included in the .NET Framework to provide access to system functionality.

Question 2

Define unmanaged code.

Answer 2

Code that is written outside the.NET Framework is known as unmanaged code.

Question 3

What is boxing?

Answer 3

Boxing: It is the process of converting a value type variable to a reference type variable (object).

Question 4

How to pass variable number of arguments in subroutine?

Question 5

Explain MessageBox.Show() function

Answer 5

Displays a dialog box

Question 6

What is the use of the Filter property of OpenFileDialog control?

Answer 6

you access the Filter property. We’ll restrict our users to only opening Text files, those that end in the extension “.txt”.

Question 7

List out any four mouse events.

Answer 7

MouseDown – occurs when a mouse button is pressed.
MouseEnter – occurs when the mouse pointer enters the control.
MouseHover – occurs when the mouse pointer hovers over the control
MouseLeave – occurs when the mouse pointer leaves the control.

Question 8

Which keyword is used to overload the subroutine?

Answer 8

You can use the Overloads keyword to define a version of the procedure for each parameter list, as follows: VB Overloads Sub post (ByVal custName As String, ByVal amount As Single) ‘

Question 9

What is the use of MustOverride keyword?

Answer 9

You can use MustOverride only in a property or procedure declaration statement.

Question 10

List out methods of data adapter object.

Answer 10

Fill: adds or updates the rows to the dataset from the data source.

FillSchema adds a data table with the same schema as in the data source.

Update: it calls insert, update, and delete SQL commands for transferring all the changes from the dataset to the data source.

Dispose of: releases all the resources.

Question 11

Explain Save File Dialog Box.

Answer 11

VB.NET Dialog Box A Dialog box is a temporary Window for an application that accepts user responses through a mouse or keyboard to open a file, save a file, notifications, alert messages, color, print, open file dialog box, etc.

Question 12

What is the use of the MyBase keyword in VB.NET?

Answer 12

MyBase is commonly used to call back into the overridden member from the member that overrides it in the derived class. The MyBase keyword can be used to call the constructor of the base class to instantiate a member of that class,

Question 13

What is the use of Option Strict statement?

Answer 13

prevents program from automatic variable conversions

Question 14

How to create Dynamic Array?

Answer 14

Dim myArr() As String
ReDim myArr(3)
myArr(0) = “One”
myArr(1) = “Two”
myArr(2) = “Three”
myArr(3) = “Four”

Question 15

Define shared variable

Answer 15

improved version of global variables called shared variables, which you place inside a class

Question 16

Write difference between Enable and Visible properties.

Answer 16

Enable means use can view the control but can’t operate or use control. Visible means user can’t see the control exist.

Question 17

What is CTS?

Answer 17

Common Type System known as CTS in .Net Framework, CTS is one of the core architectural part of .Net Framework.

Question 18

What is the use of Command Object?

Answer 18

execute select statements

Question 19

What is the scope of Friend members of the class?

Answer 19

A friend function does not fall within the scope of the class for which it was declared as a friend.

Question 20

What is the significance of Catch block in Try…Catch statement?

Answer 20

may throw an exception. When a specific type of exception occurs, a catch block catches the exception.