here's my code and that the error whenever i would add something to database.
i hope someone can help thanks :)
Dim dbDataReader As OleDb.OleDbDataReader = Nothing
Dim sqlAdd As String = "INSERT INTO Guest VALUES ('" & txtName.Text & "', '" & txtGuestId.Text & "')"
If performNonQuery(connectionString, sqlAdd) Then
MessageBox.Show("Congratulation you are now a member.")
Else
MessageBox.Show("error in saving.")
End If
If IsNumeric(txtName) Then
MessageBox.Show("That is INVALID Sir/Madam")
txtName.Text = "LASTNAME, FIRSTNAME MI."
End If