VB.NET Windows Forms Tutorial | Validate Numeric Input in TextBox Before...

Learn how to validate numeric input in a VB.NET Windows Forms application before displaying it in a MessageBox. This beginner-friendly tutorial shows step by step how to ensure users can only enter numbers in a TextBox.

In this tutorial, you will learn:

✔ How to create a VB.NET Windows Forms project

✔ How to add a TextBox and a Button

✔ How to validate numeric input using Double.TryParse

✔ How to show an error message if the input is not a number

✔ How to display valid numeric input in a MessageBox

This tutorial is perfect for beginners and intermediate VB.NET developers who want to create professional, user-friendly Windows Forms applications.

🔹 Technologies used:

- VB.NET

- Windows Forms

- Visual Studio

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