If Not IsNumeric(txtAge.Text) Then MessageBox.Show("Age must be a number") Return False End If
Private Function ValidateInputs() As Boolean If String.IsNullOrWhiteSpace(txtFirstName.Text) Then MessageBox.Show("First Name is required") Return False End If vb.net access database example
Using conn As New OleDbConnection(connectionString) Using cmd As New OleDbCommand(query, conn) ' Add parameters to prevent SQL injection cmd.Parameters.AddWithValue("@FirstName", txtFirstName.Text) cmd.Parameters.AddWithValue("@LastName", txtLastName.Text) cmd.Parameters.AddWithValue("@Email", txtEmail.Text) cmd.Parameters.AddWithValue("@Age", Convert.ToInt32(txtAge.Text)) conn.Open() cmd.ExecuteNonQuery() conn.Close() End Using End Using If Not IsNumeric(txtAge
If String.IsNullOrWhiteSpace(txtLastName.Text) Then MessageBox.Show("Last Name is required") Return False End If vb.net access database example
Imports System.Data.OleDb Public Class Form1 Dim connectionString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\VB.NET Projects\Demo\SampleDB.accdb"
Private Sub LoadData() Dim query As String = "SELECT * FROM Users" Using conn As New OleDbConnection(connectionString) Using adapter As New OleDbDataAdapter(query, conn) Dim table As New DataTable() adapter.Fill(table) dgvUsers.DataSource = table End Using End Using End Sub
Private Sub ClearInputs() txtFirstName.Clear() txtLastName.Clear() txtEmail.Clear() txtAge.Clear() txtFirstName.Focus() End Sub Private Sub dgvUsers_CellClick(sender As Object, e As DataGridViewCellEventArgs) Handles dgvUsers.CellClick If e.RowIndex >= 0 Then Dim row As DataGridViewRow = dgvUsers.Rows(e.RowIndex) txtFirstName.Text = row.Cells("FirstName").Value.ToString() txtLastName.Text = row.Cells("LastName").Value.ToString() txtEmail.Text = row.Cells("Email").Value.ToString() txtAge.Text = row.Cells("Age").Value.ToString() End If End Sub Here's the complete form code: