Lesson 21 - Nullable types, cloning, attributes, destructor and more
In the previous lesson, Structures, boxing, partial members and methods in detail, we introduced some last OOP syntax of Visual Basic .NET. In today's tutorial, we're going to finish it.
We often encounter problems when using value types, especially when it comes to databases. In databases, each column can contain a Nothing value. Unfortunately, the .NET value data types cannot contain that value. We can, however, easily specify a data type as nullable by suffixing the variable name with a question mark. Then, VB.NET allows us to store a null (Nothing) value into variables of that type. You will find that this is a very common practice when working with databases. The value inside a nullable type can be accessed via
...End of the preview...
You've come here and that's great! We believe that the first lessons showed you something new and useful
Do you want to continue the course? Go to the premium section.
Limited offer: Learn all knowledge and save money
- Unlimited and permanent access to individual lessons.
- High quality IT knowledge.
- Skills to help you get your dream and well-paid job.
Requested article covers this content:
This tutorial is the last of the object-oriented programming in VB.NET course. We'll discuss nullable types, cloning, attributes, destructors and more.
You gain credits by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.