A network link to a server might fail just as you're transferring data.Or perhaps you simply didn't allow for a particular rare circumstance in your code. NET Framework offers a robust set of tools for dealing with these unexpected problems. Label 'Required by the Windows Form Designer Private components As System. Container 'NOTE: The following procedure is required by the Windows Form Designer 'It can be modified using the Windows Form Designer. Resume Layout(False) End Sub #End Region Private Sub Text Box1_Text Changed(By Val sender As System. Text Changed End Sub Public Sub Text Box1_Validating(By Val sender As Object, _ By Val e As System. I've a winforms with some controls and an Error Provider.You should always use the Validating event, it was made to support validation.If not to prevent the focus change then at least for the Causes Validation property.
Note that any control with Causes Validation set to False will not raise a Validating event and will therefore not be validated by Validate Children.
Printing Public Class Main Class Shared Sub Main() Dim form1 As Form = New Form1() Application. Initialize Component() 'Add any initialization after the Initialize Component() call End Sub 'Form overrides dispose to clean up the component list.
New() 'This call is required by the Windows Form Designer.
However, for code readability, it would make sense to place all validation code in the Validating event.
So, which is the better option, in terms of both efficiency and industry-standards?
This might be a common scenario in data entry forms where you might create a new record and the user might not touch all the fields on your form (and thus never trigger the “Validating” event of your controls). One, pointed out by Chris Sells (read more), invokes the Control's “Notify Validating” event through Reflection.