Vb Net Lab Programs For Bca Students Fix

These programs introduce the Visual Studio IDE, basic data types, and simple event handling.

Using CInt(txtInput.Text) when the textbox is empty or contains letters. Fix: Use Integer.TryParse or Val() . Bad: Dim age = CInt(txtAge.Text)

Correct: dim result = Val(TextBox1.Text) + Val(TextBox2.Text) Problem 2: Database Connectivity Failure (ADO.NET)

End Module

Ensure your MS Access version matches the provider ( ACE.OLEDB.12.0 for .accdb , Jet.OLEDB.4.0 for .mdb ).

Catch ex As Exception MessageBox.Show("Error: " & ex.Message) Finally con.Close() ' Always close connection End Try End Sub

2 TextBoxes ( txtId , txtName ), 1 Button ( btnInsert ), 1 DataGridView ( dgvData ). vb net lab programs for bca students fix

Follow these steps to avoid environment compilation issues in the lab:

What is showing up in your output window?

Use Microsoft Visual Studio (Community Edition 2019 or later is recommended). Project Setup for Console Applications: →right arrow →right arrow Select Visual Basic →right arrow Console Application (.NET Framework). Project Setup for GUI Apps: →right arrow →right arrow Select Visual Basic →right arrow Windows Forms App (.NET Framework). These programs introduce the Visual Studio IDE, basic

' Display Sorted ListBox1.Items.Add("----------------") ListBox1.Items.Add("Sorted Array:") For Each num In arr ListBox1.Items.Add(num) Next

Use meaningful names like btnCalculate instead of Button1 .

Check if a user-inputted integer is prime or composite. Bad: Dim age = CInt(txtAge

| Session | Topic | |---|---| | 1 | Basics: Console I/O, control structures | | 2 | Arrays, collections, functions | | 3 | File handling, exceptions | | 4 | OOP basics and inheritance | | 5 | WinForms GUI and events | | 6 | Database connectivity + project start |

Factorial, Fibonacci series, Prime number check, Palindrome number.