Vb Net Lab Programs For Bca Students Fix ((top))

Dim avg As Double = sum / numbers.Length

Imports System.Data.OleDb Public Class StudentRegistration ' FIX: Define connection string globally or in a configuration block Dim connString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Db\StudentDB.accdb;" Dim conn As New OleDbConnection(connString) Private Sub btnInsert_Click(sender As Object, e As EventArgs) Handles btnInsert.Click Dim query As String = "INSERT INTO Students (StudentID, StudentName, Course) VALUES (?, ?, ?)" Dim cmd As New OleDbCommand(query, conn) ' FIX: Use parameters to avoid quote syntax errors cmd.Parameters.AddWithValue("@ID", Val(txtID.Text)) cmd.Parameters.AddWithValue("@Name", txtName.Text) cmd.Parameters.AddWithValue("@Course", txtCourse.Text) Try ' FIX: Always check state before opening If conn.State = ConnectionState.Closed Then conn.Open() cmd.ExecuteNonQuery() MessageBox.Show("Record Saved Successfully!") Catch ex As Exception MessageBox.Show("Database Error: " & ex.Message) Finally conn.Close() ' FIX: Always close connection in Finally block End Try End Sub End Class Use code with caution. 3. String Manipulation Utilities

The program crashes or concatenation occurs instead of mathematical addition (e.g., 5 + 5 results in 55 ). vb net lab programs for bca students fix

Close the database connection explicitly in the Finally block or using Using statement. Problem 3: ErrorProvider not showing validations Validations fire, but no icon appears.

Catch ex As Exception MessageBox.Show("Error: " & ex.Message) Finally ' Always close the connection If con.State = ConnectionState.Open Then con.Close() End If End Try End Sub Dim avg As Double = sum / numbers

Are you encountering during compilation?

: Mastery of decision-making constructs. Close the database connection explicitly in the Finally

To accept a number and determine if it is prime.

For i As Integer = 0 To numbers.Length - 1 If numbers(i) > maxVal Then maxVal = numbers(i) If numbers(i) < minVal Then minVal = numbers(i) sum += numbers(i) Next

Public Class StringUtilities Private Sub btnCountVowels_Click(sender As Object, e As EventArgs) Handles btnCountVowels.Click Dim input As String = txtInput.Text.ToLower() ' FIX: Standardize case Dim vowelCount As Integer = 0 ' FIX: Loop from 0 to Length - 1 to avoid IndexOutOfRangeException For i As Integer = 0 To input.Length - 1 Dim ch As Char = input(i) If ch = "a"c Or ch = "e"c Or ch = "i"c Or ch = "o"c Or ch = "u"c Then vowelCount += 1 End If Next lblResult.Text = "Total Vowels: " & vowelCount End Sub End Class Use code with caution. 4. Constructor Overloading in OOP