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).
Comment your code ( ' Comment ) to explain the logic to the examiner.
Option Strict On ' Prevents implicit type conversions Option Explicit On ' Requires variable declaration vb net lab programs for bca students fix
End Sub
Imports System.Data.OleDb ' Use System.Data.SqlClient for SQL Server Public Class LoginForm Dim conn As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\DB\Users.accdb") Private Sub btnLogin_Click(sender As Object, e As EventArgs) Handles btnLogin.Click conn.Open() Dim cmd As New OleDbCommand("SELECT * FROM Users WHERE Username='" & txtUser.Text & "' AND Password='" & txtPass.Text & "'", conn) Dim dr As OleDbDataReader = cmd.ExecuteReader() If dr.Read() Then MessageBox.Show("Login Successful") Else MessageBox.Show("Invalid Credentials") End If conn.Close() End Sub End Class Use code with caution. Part 2: Common VB.NET Lab Program Fixes & Debugging Use Microsoft Visual Studio (Community Edition 2019 or
Module Module1 Sub Main() Dim num, i As Integer Dim isPrime As Boolean = True Console.Write("Enter a number: ") num = Console.ReadLine()
Module Module1 Sub Main() Dim input As String, reversed As String = "" Dim i As Integer Console.Write("Enter a string: ") input = Console.ReadLine() Comment your code ( ' Comment ) to
If isPrime Then MessageBox.Show(num & " is a Prime Number.") Else MessageBox.Show(num & " is NOT a Prime Number.") End If
Don’t just test normal cases. Test with: