Vb Net Lab Programs For Bca Students Fix Jun 2026

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

Double-clicking the button does nothing, even with code inside. Fix: Look at the top of the code file (Designer.vb). Ensure you see: Handles Button1.Click If missing, type it manually.

Generating the Fibonacci series or a multiplication table using For...Next String Manipulation:

Public Class Student Public Property RollNo As String Public Property Name As String Public Property Marks1 As Double Public Property Marks2 As Double Public Property Marks3 As Double Public Function CalculateTotal() As Double Return Marks1 + Marks2 + Marks3 End Function Public Function CalculateAverage() As Double Return CalculateTotal() / 3 End Function Public Function GetGrade() As String Dim avg As Double = CalculateAverage() If Marks1 < 40 OrElse Marks2 < 40 OrElse Marks3 < 40 Then Return "Fail (Component Failed)" ElseIf avg >= 75 Then Return "Distinction" ElseIf avg >= 60 Then Return "First Class" ElseIf avg >= 50 Then Return "Second Class" Else Return "Pass" End If End Function End Class ' Execution Logic within Form Public Class StudentForm Private Sub btnGenerate_Click(sender As Object, e As EventArgs) Handles btnGenerate.Click Try Dim std As New Student() With .RollNo = txtRoll.Text, .Name = txtName.Text, .Marks1 = Convert.ToDouble(txtM1.Text), .Marks2 = Convert.ToDouble(txtM2.Text), .Marks3 = Convert.ToDouble(txtM3.Text) lblTotal.Text = "Total: " & std.CalculateTotal().ToString() lblAvg.Text = "Average: " & std.CalculateAverage().ToString("F2") lblGrade.Text = "Grade: " & std.GetGrade() Catch ex As FormatException MessageBox.Show("Please enter valid marks numbers.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try End Sub End Class Use code with caution. 3. Database Connectivity (ADO.NET CRUD Operations) Problem Description vb net lab programs for bca students fix

Public Class TextEditorForm Private Sub btnOpenFont_Click(sender As Object, e As EventArgs) Handles btnOpenFont.Click Dim fontDlg As New FontDialog() ' Apply to selected text or entire box if no selection exists If fontDlg.ShowDialog() = DialogResult.OK Then If RichTextBox1.SelectionLength > 0 Then RichTextBox1.SelectionFont = fontDlg.Font Else RichTextBox1.Font = fontDlg.Font End If End If End Sub Private Sub btnOpenColor_Click(sender As Object, e As EventArgs) Handles btnOpenColor.Click Dim colorDlg As New ColorDialog() If colorDlg.ShowDialog() = DialogResult.OK Then If RichTextBox1.SelectionLength > 0 Then RichTextBox1.SelectionColor = colorDlg.Color Else RichTextBox1.ForeColor = colorDlg.Color End If End If End Sub End Class Use code with caution. 5. String Manipulation Utility Problem Description

: Create a base class Employee with name, ID, and basic salary. Derive Manager and Developer classes that override a CalculateBonus() method.

Always write Option Strict On and Option Explicit On at the very top of your code files. This forces proper data conversion habits and reduces compilation surprises during grading. Ensure your MS Access version matches the provider ( ACE

Diagnosis: The logic for reversing the string is flawed. It might be using the wrong loop bounds or incorrectly comparing characters.

: Always document your code with comments, maintain proper indentation, and test edge cases (negative numbers, empty inputs, large values). A well-tested program is better than a feature-rich buggy one.

Before diving into code, shift your mindset from "coder" to "detective." An error is not a failure but crucial evidence. The goal is to methodically isolate, understand, and resolve the issue. Ensure you see: Handles Button1

This program introduces basic form controls, properties, and event-driven data type conversions.

Sorting (Bubble/Selection), Searching (Linear/Binary), String reversal, Vowel counting.

The program runs without crashing, but produces incorrect results. The code is syntactically correct and executes, but it doesn’t do what you intended.