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Visual Basic .NET is a programming language that is commonly used for creating Windows applications. It is considered to be a beginner-friendly language, which makes it a great choice for those who are new to programming. In this article, we will be discussing the “ByVal” and “ByRef” keywords, which are used in Visual Basic .NET to specify how variables are passed between subroutines and functions.
When you pass a variable to a subroutine or function in Visual Basic .NET, you have the option to use either the “ByVal” keyword or the “ByRef” keyword. The “ByVal” keyword tells the subroutine or function to work with a copy of the original variable, while the “ByRef” keyword tells the subroutine or function to work directly with the original variable.
The “ByVal” keyword is the default option when passing a variable to a subroutine or function. This means that if you don’t specify the “ByVal” or “ByRef” keyword, the subroutine or function will assume that you want to pass the variable by value. When a variable is passed by value, any changes made to the variable inside the subroutine or function will not affect the original variable. This is useful when you want to make sure that the original variable remains unchanged.
On the other hand, the “ByRef” keyword tells the subroutine or function to work directly with the original variable. When a variable is passed by reference, any changes made to the variable inside the subroutine or function will also be made to the original variable. This is useful when you want to allow the subroutine or function to make changes to the original variable.
It is important to note that when passing an object, the “ByVal” and “ByRef” keywords work differently than when passing a value type. When passing an object by value, a reference to the object is passed, not a copy of the object, thus any changes made to the object will be reflected in the original object as well.
In summary, the “ByVal” and “ByRef” keywords in Visual Basic .NET are used to specify how variables are passed between subroutines and functions. The “ByVal” keyword tells the subroutine or function to work with a copy of the original variable, while the “ByRef” keyword tells the subroutine or function to work directly with the original variable. Understanding the difference between these two keywords can help you create more efficient and effective code.
Cookbook – VisualBasic.NET for Beginners – Chapter 18 : ByVal and ByRef keywords
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