These foundational programs help students understand basic syntax, data types, and control structures in VB.NET. Program 1: Fibonacci Series Generation Generate the Fibonacci series up to Key Concept: Loops and conditional logic.
TextBox (for input/output), Button (for operators), Label . B. Validations and Event Handling
BCA curriculums generally focus on GUI fundamentals, database connectivity, and object-oriented concepts. Here are the core programs you must master: A. Basic GUI Application (Calculator)
Write student roll no, name, marks to a text file; read and display.
' Write to file Using writer As New IO.StreamWriter("C:\BCALab\students.txt", True) ' True = append writer.WriteLine($"txtRoll.Text|txtName.Text|txtMarks.Text") End Using ' Automatically flushed and closed
The button control btnAdd was deleted from the designer form, or its name property was changed after the code-behind stub was generated.
If rowsAffected > 0 Then MessageBox.Show("Record Inserted Successfully") ClearFields() Else MessageBox.Show("Insertion Failed") End If
' Reading from file Try Dim reader As StreamReader = New StreamReader(path) text = reader.ReadToEnd() reader.Close() Console.WriteLine("File Content:") Console.WriteLine(text) Catch ex As Exception Console.WriteLine("Read Error: " & ex.Message) End Try
: Design a parent form that can open and manage multiple child forms. 4. Advanced Application Logic
Factorial, Fibonacci series, Prime number check, Palindrome number.
VB.NET, BCA curriculum, debugging, event-driven programming, lab programs, error handling.
This is where many BCA students lose marks. Buttons don't work, or values don't calculate.
Public Class Form1 Private Sub btnCheck_Click(sender As Object, e As EventArgs) Handles btnCheck.Click Dim num As Integer Dim isPrime As Boolean = True
Dim rowsAffected As Integer = cmd.ExecuteNonQuery()