How do you handle Exceptions in Visual Basic?

What is exception handling in Visual Basic?

In Visual Basic (VB.NET), exception handling is a way to manage runtime errors so that your program does not crash. Instead of stopping execution, VB lets you “catch” errors and respond to them safely.

Try...Catch...Finally structure

VB.NET uses three main blocks for handling exceptions:

• 🧪 Try — code that might cause an error
• ⚠️ Catch — code that handles the error
• 🧹 Finally — code that always runs

Basic example

Try
    Dim result = 10 / 0

Catch ex As Exception
    Console.WriteLine(ex.Message)

Finally
    Console.WriteLine("Execution complete")
End Try

Here, dividing by zero causes an error, but the program catches it instead of crashing.

Handling specific exceptions

You can also catch specific error types instead of all exceptions.

Try
    Dim nums = New Integer() {1, 2, 3}
    Console.WriteLine(nums(10))

Catch ex As IndexOutOfRangeException
    Console.WriteLine("Index is out of range!")

Catch ex As Exception
    Console.WriteLine("General error occurred")

Finally
    Console.WriteLine("Done")
End Try

Why exception handling is important

• 🛡️ Prevents program crashes
• ⚙️ Improves user experience
• 🔍 Helps debug errors safely
• 📦 Makes applications more reliable

When to use Finally

The Finally block is used for cleanup tasks like closing files, releasing resources, or disconnecting databases.

Finally
    file.Close()
End Try

Summary

In Visual Basic, exceptions are handled using Try, Catch, and Finally blocks. This ensures your program can handle errors gracefully without crashing.

In short: Try runs code, Catch handles errors, Finally always executes.