ASP.NET Razor VB Loops and Arrays

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# ASP.NET Razor - VB Loops and Arrays

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Statements can be executed repeatedly in loops.

## For Loops

If you need to run the same statements repeatedly, you can program a loop.

If you know how many times you want to loop, you can use a for loop. This kind of loop is especially useful for counting up or counting down:

## Example

<html>
<body>
@For i=10 To 21
@<p>Line #@i</p>
Next i
</body>
</html>
Run example »

## For Each Loops

If you work with a collection or an array, you often use a for each loop.

A collection is a group of similar objects, and the for each loop lets you carry out a task on each item. The for each loop walks through a collection until it is finished.

The example below walks through the ASP.NET Request.ServerVariables collection.

## Example

<html>
<body>
<ul>
@For Each x In Request.ServerVariables
@<li>@x</li>
Next x
</ul>
</body>
</html>
Run example »

## While Loops

The while loop is a general purpose loop.

A while loop begins with the while keyword, followed by parentheses, where you specify how long the loop continues, then a block to repeat.

While loops typically add to, or subtract from, a variable used for counting.

In the example below, the += operator adds 1 to the variable i, each time the loop runs.

## Example

<html>
<body>
@Code
Dim i=0
Do While i<5
i += 1
@<p>Line #@i</p>
Loop
End Code
</body>
</html>
Run example »

## Arrays

An array is useful when you want to store similar variables but don't want to create a separate variable for each of them:

## Example

@Code
Dim members As String()={"Jani","Hege","Kai","Jim"}
i=Array.IndexOf(members,"Kai")+1
len=members.Length
x=members(2-1)
end Code
<html>
<body>
<h3>Members</h3>
@For Each person In members
@<p>@person</p>
Next person
<p>The number of names in Members are @len</p>
<p>The person at position 2 is @x</p>
<p>Kai is now in position @i</p>
</body>
</html>
Run example »
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