This tutorial is all about Allowing Numbers only in Textbox Using VB.Net. With this tutorial about Allowing Numbers only in Textbox Using VB.Net we set a restriction on textbox which allow us to enter only numbers. So let’s get started:
- First is open the Visual Basic, Select File on the menu, then click New and create a new project.
- Then a New Project Dialog will appear. You can rename your project, depending on what you like to name it. After that click OK
- Then design your form like this just like what I’ve shown you below
Select a Textbox and label.
- Add this code to the TextBox KeyPress event.
[vbnet]Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
If Asc(e.KeyChar) <> 13 AndAlso Asc(e.KeyChar) <> 8 AndAlso Not IsNumeric(e.KeyChar) Then
MessageBox.Show("Please enter numbers only")
e.Handled = True
End If
End Sub[/vbnet]<li>After that, Click F5 to run the program.<br>
Output:</li>
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Frequently Asked Questions
What does this VB.NET WinForms control example demonstrate?
Core Windows Forms control (TextBox, CheckBox, RadioButton, ListBox, TreeView, ProgressBar, Button, DateTimePicker, PictureBox, MenuStrip, ToolStrip, Chart, etc.) usage pattern: properties, events, data binding, common gotchas.
What Visual Studio and SQL Server versions does this VB.NET project require?
Most projects use VB.NET WinForms on .NET Framework 4.5+ with SQL Server 2012 Express or higher. To run: install Visual Studio 2019 / 2022 (Community is free) with the ‘Desktop development with .NET’ workload, install SQL Server Express + SSMS, open the .sln file, build, run.
How do I set up the database for this VB.NET project?
Open SQL Server Management Studio (SSMS) and connect to your SQL Server (e.g. localhost\SQLEXPRESS). Right-click Databases, choose Restore Database OR New Database then import the included .sql script. Update the connection string in App.config (or in code-behind Module) with your server name + credentials. Rebuild and run.
Can I use this VB.NET project for a BSIT capstone or thesis?
Yes, VB.NET is one of the most accepted languages by Philippine BSIT panels. Extend it: add role-based access (admin/staff/customer login redirect), Crystal Reports or RDLC reports, dashboards with Chart control, audit log, multi-branch support. Pair with Chapter 1-5 documentation matching your panel’s rubric.
Why am I getting ‘connection error’ or ‘cannot find SQL Server’?
Three common VB.NET issues: (1) Connection error: SQL Server isn’t running. Open SQL Server Configuration Manager and verify SQL Server (SQLEXPRESS) service is started. (2) Wrong server name in connection string. Try .\SQLEXPRESS, (local)\SQLEXPRESS, or your machine name. (3) Login failed: SQL Server is set to ‘Windows-only’ authentication. Switch to Mixed Mode in SSMS Server Properties, Security.
Where can I find more VB.NET projects with source code?
Browse the VB.NET Projects hub for the full library. For C# WinForms alternatives see C# Projects. For ASP.NET web alternatives see ASP.NET Projects. For BSIT capstone idea lists see 150 Best Capstone Project Ideas.