Random Code Generator using VB.Net

Random Code Generator using VB.Net

Random Code Generator using VB.Net.

In this tutorial, you will learn how to create your own code generator based on your declared string value.

This is good especially when you want to create a project that needs auto-generator code for special coupons or primary keys to an information.

Let’s create our new project and drag a label, text box and button. See the sample image below:

Next, let’s do coding! We will first create our function to return a random string. But first, you need to import System.Text to use the Class StringBuilder.

[vbnet]

Imports System.Text

Private Function autogenerateCode() As String
Dim builder As New StringBuilder()
Dim allowedCharacters As String = "abcd1234"
Dim randomCode As New Random

For i As Integer = 1 To 4
Dim index As Integer = randomCode.Next(0, allowedCharacters.Length)
Dim randomCharacter As Char = allowedCharacters(index)
builder.Append(randomCharacter)
Next i

Dim randomString = builder.ToString()
Return randomString
End Function

[/vbnet]

Next, double click your button and add this line of code:

[vbnet]

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
TextBox1.Text = autogenerateCode()
End Sub

[/vbnet]

After that, try to run your system and push the button. You would notice that the system is giving a random code based on your allowedCharacters declared string in autogeneratecode() function and the length of your random code depends on your declared For loop to integer. Here’s the example output based on our code:

Let’s try to change the allowedCharacters string and the for loop to integer.

[vbnet]

Dim allowedCharacters As String = "wxyz0987"

For i As Integer = 1 To 6
Dim index As Integer = randomCode.Next(0, allowedCharacters.Length)
Dim randomCharacter As Char = allowedCharacters(index)
builder.Append(randomCharacter)
Next i

[/vbnet]

Try to run your new code and see your results. Here’s my output:

Congratulations! You now learned how to create your own auto-generator code using VB.Net!

For questions or any other concerns or thesis/capstone creation with documentation, you can contact me through the following:

E-Mail: [email protected]

Facebook: facebook.com/kirk.lavapiez

Contact No.: +639771069640

Ian Hero L. Lavapiez

BSIT Graduate

System Analyst and Developer

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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 Random Code Generator using VB.Net

• 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.