Hi Everyone, In my form there is a "Validating" event on a textbox. Is there a way to not execute the "Validating" event when the user clicks on the "Cancel" button? End Sub Private Sub Button1_Mouse Leave(By Val sender As Object, By Val e As System. Mouse Leave b Validate Text Box = True '// Enable Validation. End Sub Private Sub Text Box1_Validating(By Val sender As Object, By Val e As System. Truly, Emad Public Class Form1 Private b Validate Text Box As Boolean = True Private Sub Button1_Mouse Enter(By Val sender As Object, By Val e As System. Mouse Enter b Validate Text Box = False '// Disable Validation. Msg Box("Text Box Validation was Canceled") '// for testing. Validating If b Validate Text Box Then '// validating code here. Each new exception can preserve the information about the previous one by storing it in this property.As a follow up to my previous post about enhancing the validation controls within Windows Forms, there might be times when you would like to manually invoke the “Validating” event of a control.Consistent use of these techniques will help make your applications more robust and reliable.When an application encounters an unexpected situation (such as a missing file or input parameter) or a logical error (performing a division-by-zero operation, for example), by default the application will terminate and generate an error display like the one shown in Figure 3.1. NET displays an error message and terminates the application when any error occurs. NET the more I like d Base III Plus The foregoing, whilst believed to be correct, is given without guarantee as to it's accuracy and entirely without recourse. NET textbox, which event handler is better to use: Validating or Leave?
Run(form1) End Sub End Class Public Class Form1 Inherits System. Protected Overloads Overrides Sub Dispose(By Val disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components. Dispose(disposing) End Sub Friend With Events Text Box1 As System. 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.I'd recommend staying away from reflecting on the internal methods and properties of Framework classes.This will future proof your code as much as possible and prepare you for any breaking changes down the road to the internals of the Framework.For example, you might want to have a routine that fires on the form's “Closing” event or a data save method to loop through all the controls on your form and validate them independently to ensure that all controls are valid.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.Here is an example: You can also trigger the Validation event by giving focus to a control and taking the focus away.You might even loop through all the controls on your form and focus each of them individually (or an individual control by giving it focus then changing the focus to another control), achieving the same effect: Which solution is better? 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.