Correct: dim result = Val(TextBox1.Text) + Val(TextBox2.Text) Problem 2: Database Connectivity Failure (ADO.NET)
Which or assignment you are working on right now?
' The Fix for Division If num2 = 0 Then LabelResult.Text = "Error: Division by zero" Else result = num1 / num2 LabelResult.Text = "Result: " & result.ToString() End If End Sub ' (Similar code for Sub and Mul) vb net lab programs for bca students fix
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
' Correct loop bounds for an array of size n For i = 0 To size - 2 For j = 0 To size - i - 2 If a(j) > a(j + 1) Then ' Swap elements Dim temp As Integer = a(j) a(j) = a(j + 1) a(j + 1) = temp End If Next Next Use code with caution. Copied to clipboard Fix Detail : Ensure the inner loop stops at size - i - 2 Correct: dim result = Val(TextBox1
VB.NET is a core component of the Bachelor of Computer Applications (BCA) curriculum, bridging the gap between procedural programming and Object-Oriented Programming (OOP). However, textbook lab programs often contain syntax errors, deprecated functions, or logic flaws that fail in modern Visual Studio environments.
: Students often declare variables as Private Name As String in the parent class and wonder why the child class cannot access it. Copied to clipboard Fix Detail : Ensure the
1 TextBox ( txtInput ), 1 Button ( btnCheck ), 1 Label ( lblOutput ). Source Code
Create a base class Person and a derived class Student to calculate total marks, percentage, and grade.
InvalidCastException or "Conversion from string to type 'Double' is not valid."