Loops in VB.NET With Examples [ Do, Do Until, For, and For Each ]

How to Use Loop in VB.NET With Examples [ Do, Do Until, For, and For Each ]

This tutorial will discuss how to use different loops in vb.net with examples specifically the Do While, Do Until, For, and For Each loop.

Do While Loop

Do While loop can have one or more conditions in its expression. In performing it, you have to use a special syntax form. This syntax form gives a way to continue performing while one or more conditions are true.

This is the syntax in doing Do While Loop.

Do While [counter] >= [start #]  And  [counter]  <= [start #]

statements…..
Loop

Example.

Dim i As Integer = 100
Dim z As Integer = 0

Do While i >= 0 And z <= 20

i = i - 10
z = z + 3

MsgBox(i & " " & 3)
Loop

Do Until Loop

In Visual Basic, all loops have a similar purpose that makes a block of statements to repeat a number of times.

The Do Until and the Do While loop is a bit similar to each other. The only difference of the Do Until loop is, it uses a  slightly different syntax.

Take note that if you are not careful with the syntax of Do Until it will result in an infinite Loop

This is the example in doing Do Until Loop.

Dim i As Integer = 0
Do Until i = 10

i += 1

MsgBox(i)
Loop

For Loop

The For Loop repeats a group of statements in a specified number of times while a loop index counts the number of loop iterations as the loop performs.

This is the syntax in constructing a loop.

For [counter variable] as [datatype] = [start #] to [end #]
statements…..
nex [counter variable]

Example:

For i As Integer = 1 To 10
i = +i
MsgBox(i)
Next i

For Each Loop

One way to loop over the elements in an array using visual basic is to use For each loop. Because it automatically loops over all elements in the array or collections.

And it works well when you can associate each iteration of a loop with a control variable and determine that variable’s initial and final values. And you don’t have to worry about getting the indices in order to get all the elements.

For Each Loop Syntax

For Each element [ As datatype ] In group
[ statements ]
[ Continue For ]
[ statements ]
[ Exit For ]
[ statements ]
Next [ element ]

The For Each loop is always the best choice when you are dealing with every single element or an item in a group. For example, your looping every single file in a folder or any character in a string.

This time, let’s Open visual basic and Create a New Project then save it as “Foreach“. Then, add a button on the windows form and change the Text property to “Go“.

Next, we’re going to add functionality to an application. To do this double click the button and add the following code:

       'declare array as a string with six index
        Dim letter(6) As String
        'here, we assign values to specific index of an array
        letter(0) = "VISUAL"
        letter(1) = "BASIC"
        letter(2) = "or"
        letter(3) = "VB.NET"
        letter(4) = "Progamming"
        letter(5) = "is"
        letter(6) = "FUN"

        ' Iterate through the list.
        For Each i As String In letter
            ' Display the letter
            MsgBox(i)
        Next 'Taking the Next step

When you run this code, you will see a series of outputs like as shown below.

VISUAL
BASIC
or
VB.NET
Progamming
is
FUN

Summary

In summary, we have discussed the different types of loop in vb.net and we have presented each loop with an example.

Anyway, the learning we have in this vb.net tutorial will vary in different situations, therefore, it is necessary for us to know the different used of loops in vb.net so that we will be able to apply it effectively in our individual systems.

The previous article is about VB.Net Data Types and variable Declaration with DIM.

Technology stack and requirements

To run this VB.NET project, you need the following on your development machine:

• Visual Studio 2019 or later. The free Community Edition is enough for building, debugging, and running the project.
• .NET Framework 4.7.2 or higher. Most Windows 10 and 11 systems have it preinstalled through Windows Update.
• MySQL Server 8.0 or MSSQL Express 2019. Choose whichever your capstone panel prefers; both work with VB.NET data adapters.
• MySQL Connector/NET or SqlClient library. Add via NuGet Package Manager inside Visual Studio.
• Crystal Reports (optional). Required only if the project generates printable reports; install the runtime redistributable.

Installing the source code

The download link contains a ZIP archive with the full solution. Extract and set up in five steps:

1. Extract the archive to a folder outside Program Files (avoids permission issues).
2. Open the .sln file in Visual Studio. It loads the full solution with all forms and modules.
3. Restore NuGet packages. Right-click the solution then Restore NuGet Packages if prompted.
4. Import the database. Locate the .sql file in the archive and import via phpMyAdmin (MySQL) or SQL Server Management Studio.
5. Update the connection string in App.config or module code to match your local database name, user, and password.

How to use this project for your BSIT capstone

This VB.NET project maps cleanly to standard BSIT capstone documentation. Suggested chapter alignment:

• Chapter 1 (Introduction). Discuss the problem the system solves in real-world context. Cite Philippine business or academic use cases where a manual process could be replaced.
• Chapter 2 (Review of Related Literature). Compare this system’s features against 5-10 similar published projects. Cite journals like IJERT or IEEE Access for academic-standard sources.
• Chapter 3 (Methodology). Include Use Case Diagram, Data Flow Diagram, Entity Relationship Diagram, and Activity Diagram covering all major workflows in the system.
• Chapter 4 (Results and Discussion). Screenshot each module of the running system with a caption explaining what data it processes and which user role interacts with it.
• Chapter 5 (Conclusion and Recommendations). Identify features that could be added in a Version 2, such as web dashboard, mobile app, or REST API export.

Modules typical of Loops

• Master data. CRUD forms for the primary entities the system manages, with search and filter.
• Transaction processing. Data entry forms for the day-to-day operations the system automates.
• Reports. Formatted printable output summarizing activity per day, per user, or per category.
• User management. Login with role-based permissions (Admin, Encoder, Viewer).
• Backup and restore. Export database to a .sql or .bak file and restore when needed.

Common enhancements for capstone review

• Modernize the UI. Add Bunifu or Guna UI controls for a more polished, modern appearance.
• Add printable receipts. Integrate a printer preview form with page-setup options.
• Multi-user concurrency. Ensure the database handles simultaneous writes without lost-update errors.
• Web version. Rewrite the front-end in ASP.NET Core or React for a modern deployment path.

Inquiries

For any questions or suggestions about loops in vb.net with examples, please feel free to leave a comment below.