Tag: vb

Questions Related to vb

How do you create a Read only Property in VB.NET
.net vb

  1. Using Only Get..EndGet with in property definition

  2. Using Only Set..EndSet with in property definition

  3. Using both Get and Set

Show answer
Correct Option: A

The constructors in VB.Net is similar to which event in previous versions of VB
.net vb

  1. Class_Load

  2. Class_Terminate

  3. Class_Initialize

Show answer
Correct Option: C

Which interface allows to implement the Dispose method to do cleanup work
.net vb

  1. Idestructor

  2. Icleanup

  3. Idisposable

Show answer
Correct Option: B

How do you call non shared methods of a class
.net vb

  1. Directly invoking the method name

  2. Invoking the method through the instance of that class

  3. None of the above

Show answer
Correct Option: B
Explanation:

To call non-shared methods of a class, the user needs to know the concept of object-oriented programming and the difference between shared and non-shared methods. Non-shared methods are specific to an instance of a class, while shared methods are accessible by all instances of a class.

Now, let's go through each option and explain why it is right or wrong:

A. Directly invoking the method name: This option is incorrect because invoking a non-shared method directly through the method name will result in a compilation error. Non-shared methods require an instance of the class to be created first before they can be accessed.

B. Invoking the method through the instance of that class: This option is correct. To call a non-shared method, you need to create an instance of the class and then call the method through that instance. This allows the method to access the instance's specific data and perform actions specific to that instance.

C. None of the above: This option is incorrect because option B is the correct way to call non-shared methods.

Therefore, the answer is: B. Invoking the method through the instance of that class.

How do we implement private interfaces
.net vb

  1. Using Inherits Keyword

  2. Private interfaces can not be implemented

  3. Using Implements Keyword

Show answer
Correct Option: B

Where do you find COMException class

.net vb

  1. System.Runtime.Interopservices

  2. System.XML

  3. System. Data

Show answer
Correct Option: A

Which method of the XMLdocument class takes xml as string while loading
.net vb

  1. Loadxml ( )

  2. Load( )

  3. Save ( )

Show answer
Correct Option: A

Which is the base class for TypedDataset
.net vb

  1. DataReader

  2. Dataset

  3. DataAdapter

Show answer
Correct Option: B
Explanation:

To answer this question, the user should be familiar with the concept of typed datasets and their relationship to other classes in the .NET framework.

The correct answer is:

B. Dataset

Explanation:

In the .NET framework, the base class for typed datasets is the Dataset class. A typed dataset is a dataset that is derived from the Dataset class and includes additional features such as strongly-typed data tables and data columns.

A. DataReader is not the base class for TypedDataset. The DataReader class is used for reading data from a database and does not have a direct relationship to typed datasets.

C. DataAdapter is also not the base class for TypedDataset. The DataAdapter class is used for retrieving and updating data from a database, but it is not the base class for typed datasets.

Therefore, the correct answer is B. Dataset.

Which is the best to retrieve Read-Only, Forward-only stream of data from database
.net vb

  1. Data Set

  2. Typed Data Set

  3. DataReader

Show answer
Correct Option: C

The DataAdapter uses which of the following object to retrieve the data from database

.net vb

  1. Connection

  2. Command

  3. DataReader

Show answer
Correct Option: B

AI Explanation

To answer this question, we need to understand the purpose of the DataAdapter and its relationship with other objects involved in retrieving data from a database.

The DataAdapter is a part of the ADO.NET framework and is used to retrieve data from a database and populate a DataTable or a DataSet. It acts as a bridge between the database and the application.

The DataAdapter uses the following objects to retrieve data from the database:

A. Connection - The Connection object is responsible for establishing a connection to the database. It provides the necessary information, such as the database server name, credentials, and other connection parameters. The DataAdapter requires a Connection object to establish a connection to the database, but it does not directly use the Connection object to retrieve data.

B. Command - The Command object is used to execute SQL queries or stored procedures against the database. It represents a single command to be executed, such as SELECT, INSERT, UPDATE, or DELETE. The DataAdapter uses the Command object to execute the query or stored procedure and retrieve the data from the database. The Command object can be an instance of the SqlCommand, OleDbCommand, or MySqlCommand classes, depending on the database provider being used.

C. DataReader - The DataReader object provides a fast, forward-only, read-only access to the data retrieved from the database. Unlike the DataAdapter, the DataReader is used for retrieving data row by row, typically when you need to iterate over a large result set. The DataReader is not used directly by the DataAdapter to retrieve data.

Therefore, the correct answer is B. The DataAdapter uses the Command object to retrieve data from the database by executing SQL queries or stored procedures.