Dim maxVal As Integer = numbers(0) Dim minVal As Integer = numbers(0) Dim sum As Integer = 0
: Understanding code reusability and runtime polymorphism.
Imports System.Data.OleDb Public Class StudentForm ' Update the connection string path based on your local project layout Dim connString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\StudentDB.accdb;" Dim conn As New OleDbConnection(connString) Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click Dim query As String = "INSERT INTO Students (RollNo, StudentName, Course) VALUES (?, ?, ?)" Using cmd As New OleDbCommand(query, conn) cmd.Parameters.AddWithValue("@RollNo", Convert.ToInt32(txtRollNo.Text)) cmd.Parameters.AddWithValue("@Name", txtName.Text) cmd.Parameters.AddWithValue("@Course", txtCourse.Text) Try conn.Open() cmd.ExecuteNonQuery() MessageBox.Show("Record Saved Successfully!") Catch ex As Exception MessageBox.Show("Database Error: " & ex.Message) Finally conn.Close() End Try End Using End Sub End Class Use code with caution. Common Errors & Fixes vb net lab programs for bca students fix
Note: Ensure you add System.Data.OleDb or System.Data.SqlClient namespaces depending on your target database system.
Database connectivity using ADO.NET is crucial for final year projects and advanced laboratory sessions. Dim maxVal As Integer = numbers(0) Dim minVal
Connecting a VB.NET application to a database (like Microsoft SQL Server or MS Access) is a common final lab assignment. This is where errors become more complex.
: Use ListBox for font names, TrackBar for font size, RadioButton for color selection to dynamically change text appearance in a Label. Database connectivity using ADO
' Read from file If IO.File.Exists("C:\BCALab\students.txt") Then Using reader As New IO.StreamReader("C:\BCALab\students.txt") Dim line As String While reader.Peek() >= 0 line = reader.ReadLine() Dim fields() As String = line.Split("|"c) ListBox1.Items.Add($"Roll: fields(0), Name: fields(1), Marks: fields(2)") End While End Using Else MessageBox.Show("File not found") End If