Do While Wend Loop statement in ASP

Looping is a common requirement in any scripting language, we will learn here how to use Do While, Until, Loops to manage execution of the code blocks more than once.

Let us start with do While Loop, here the condition is checked for the starting of the loop and the code is executed only if the condition is TRUE. Here is the syntax

Do While condition

Script block  here 
Loop

As long as the condition is satisfied ( or True ) the script block will be executed. Always at the starting the Condition is checked. Here is a simple script using Do While loop.

Dim my_num
my_num=1

Do While  my_num <=10
Response.Write my_num  & "<br>"
my_num = my_num +1 
Loop

The above code will print 1 to 10 and it will fail to print 11 as the condition checking will return False. We can modify the Do While loop and keep the condition checking at the end of the Loop.

Do 
Script block here
Loop While Condition

Now let us change our old example and try this way.

Dim my_num
my_num=11

Do 
Response.Write my_num  & "<br>"
my_num = my_num +1 
Loop While  my_num <=10

Here we can see there is a output of 11 as the inside the loop code is executed once even before the condition is checked and found False. So this way at least once the code inside the Loop will be executed. Test the above code by adding the While condition at the starting of the loop.

Sometime we may try to execute the loop till the condition becomes True. For this we can use Do Until Loop statement. Here is the code.

Dim my_num
my_num=1
Do Until my_num > 10
Response.Write my_num  & "<br>"
my_num = my_num +1 
Loop

VBScript also supports the older While ... Wend form, but Do While ... Loop is more flexible and is used throughout these tutorials.
ASP Home

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

About the author Watch on YouTube

Connect:

Do While, Do Until and loops in VBScript

Further Reading

Subhendu Mohapatra