How to Fill Data in the ComboBox in VB.net

How to Fill Data in the ComboBox in VB.net

This tutorial is all about How to Fill Data in the ComboBox in VB.net Programming language.
In this tutorial, I will teach you how to fill the data in the ComboBox in VB.Net.

With this, the record in the database will be displayed in the list control of the ComboBox.

This is very helpful, because you can control whatever the records that you want to display in the ComboBox.

What is Visual Basic’s purpose?

The third-generation programming language was created to aid developers in the creation of Windows applications. It has a programming environment that allows programmers to write code in.exe or executable files.

They can also utilize it to create in-house front-end solutions for interacting with huge databases. Because the language allows for continuing changes, you can keep coding and revising your work as needed.

However, there are some limits to the Microsoft Visual Basic download. If you want to make applications that take a long time to process, this software isn’t for you.

That implies you won’t be able to use VB to create games or large apps because the system’s graphic interface requires a lot of memory and space.

Furthermore, the language is limited to Microsoft and does not support other operating systems.

What are the most important characteristics of Visual Basic?

Microsoft Visual Basic for Applications Download, unlike other programming languages, allows for speedier app creation. It has string processing capabilities and is compatible with C++, MFC, and F#.

Multi-targeting and the Windows Presentation Framework are also supported by the system, allowing developers to create a variety of Windows apps, desktop tools, metro-style programs, and hardware drivers.

Let’s begin:

Now, create a database named<strong> “dbstudent”</strong> in MySql Database.

Then create a table in it.

[<mysql]
CREATE TABLE IF NOT EXISTS `tblstudent` (
`ID` int( 11 ) NOT NULL AUTO_INCREMENT ,
`stud_id` varchar( 99 ) NOT NULL ,
`fname` varchar( 99 ) NOT NULL ,
PRIMARY KEY ( `ID` ) ,
UNIQUE KEY `stud_id` ( `stud_id` )
[/mysql]

Open the Visual Studio 2008 and create a new Window Form Application. Drag a ComboBox on the Form and It will look like this.

After setting up the Form, double click the Form and set the connection and declare all the classes that are needed above the Form1_Load.

[vbnet]
'CREATE A PUBLIC FUNCTION FOR A CONNECTION
Public Function MySQLconnection() As MySqlConnection
'RETURNING THE NEW CONNECTION
Return New MySqlConnection("server=localhost;user id=root;database=dbstudent")
End Function
'INITIALIZE A PUBLIC VARIABLE TO THE FUNCTION THAT YOU HAVE CREATED.
Public con As MySqlConnection = MySQLconnection()
'SET AS THE BRIGDE BETWEEN THE DATABASE AND DATATABLE IN UPDATING AND SAVING THE DATA.
Public da As New MySqlDataAdapter
'IT REPRESENT AN IN-MEMORY CACHE OF DATA IN THE DATABASE
Public ds As New DataSet
[/vbnet]

After that, you have to set up data to be filled in the ComboBox and put it in the Form1_Load.

[vbnet]
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'INTIALIZE THE NEW DATASET
ds = New DataSet
'FOR RETRIEVING AND FILLING DATA IN THE TABLE
da = New MySqlDataAdapter("SELECT * FROM tblstudent", con)
da.Fill(ds)

With ComboBox1
'INTIALIZE THE DATASOURCE OF THE COMBOBOX
.DataSource = ds.Tables(0)
'SET THE FIELD OF THE TABLE THAT WILL DISPLAY IN THE LIST CONTROL OF THE COMBOBOX.
.DisplayMember = "fname"
End With
End Sub
[/vbnet]

Remider : Set your reference above the Public Class for the imports.

[vbnet]
'SET YOUR REFFERENCES
Imports MySql.Data.MySqlClient
[/vbnet]

Press F5 on the keyboard to run your project.

Readers might read also:

• Simple Insert and Show Data from Database in PHP and MYSQL
• Displaying Data Table Records in Datagridview using VB.Net

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 How to Fill Data in the ComboBox

• 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.