Control Statements in VB.NET For Next Loop

The For Next loop is a common control statement used in VB.NET to execute a block of code a fixed number of times. In this page, we will discuss the syntax, example, output, explanation, use, important points and summary of For Next loop control statements.

Syntax

The syntax for the For Next loop in VB.NET is as follows:

For counter As Integer = start To end Step increment
    'block of code to be executed
Next

• counter is a variable that keeps track of the current iteration of the loop. It is declared and initialized in the loop header.
• start is the initial value of the counter variable.
• end is the final value of the counter variable.
• increment is the amount that the counter variable is incremented on each iteration of the loop.
• The Step keyword is optional and controls the direction and magnitude of the increment.

Example

Here's an example of a For Next loop that prints the numbers from 1 to 10:

For i As Integer = 1 To 10
    Console.WriteLine(i)
Next

Output

The output for the above example code would be:

1
2
3
4
5
6
7
8
9
10

Explanation

In the example code, a counter variable i is initialized to 1, and the loop will run until i is greater than 10. The Console.WriteLine method is called in the loop body, which will print the value of i to the console window on each iteration. The value of i is incremented by 1 at the end of each iteration.

Use

For Next loops are useful in situations where a block of code needs to be executed a fixed number of times. Some common use cases include iterating over collections, performing calculations, and generating data structures.

Important Points

• The counter variable must be declared and initialized in the For loop header.
• The loop will continue to execute until the counter variable reaches the end value.
• The Step keyword is optional, but controls the magnitude and direction of the counter variable increment.
• The Next keyword is used to end the loop and return control to the calling code.

Summary

In this page we discussed the syntax, example, output, explanation, use, and important points of VB.NET For Next loop control statements. For Next loops are used when you need to execute a block of code a fixed number of times and are an important tool in the VB.NET developer's toolkit.