Halt Validation

[Moonshot]

How do I halt validation on controls on a form if the user presses a cancel button on that form?

Private Sub Wizard1_CancelButtonClick(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles Wizard1.CancelButtonClick
Try
If MessageBox.Show("You want to cancel?", "Cancel Wizard", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = Windows.Forms.DialogResult.Yes Then

Me.Close()
End If
Catch
MsgBox("There is an error")
End Try
End Sub

Trouble is is that I have a textbox on the form that validates user input

Private Sub Dont_Leave_empty(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles NAMETextBox.Validating, ADDRESSTextBox.Validating

If Me.Table1BindingSource.Current IsNot Nothing And sender.Text = String.Empty Then

'Perform validation here.

MessageBox.Show(" You cannot leave this field blank", "Required Field", MessageBoxButtons.OK, MessageBoxIcon.Warning)
e.Cancel = True
Else
sender.Text = sender.Text.Trim()

End If

And this won't allow me to either cancel the user input or close the form

[Hack]

Try using a Form level Boolean. Something like blnIsCancelled

Insert, as the first line of your code

If blnIsCancelled Then Exit Sub

[Moonshot]

Thats an idea - thanks hack

[Hack]

That is typically how I handle cancelling a looping process, but, it should work the same way for this situation.

[Tinbeard]

Set the CausesValidation property of the cancel button to false.

[Moonshot]

Because e.cancel is set to true - it won't allow a boolean to be set when the cancel button is pressed

[jmcilhinney]

Because e.cancel is set to true - it won't allow a boolean to be set when the cancel button is pressed

He means in the designer. If you set a control's CausesValidation property to False then when that control receives focus the previous control's Validating and Validated events are not raised, which is exactly what you want.

[Moonshot]

He means in the designer. If you set a control's CausesValidation property to False then when that control receives focus the previous control's Validating and Validated events are not raised, which is exactly what you want.

Yes but the causevalidation property is already set to false - the problem occurs because the textbox on which the form resides causes validation to fire if the field is left empty and the user tries to move to another textbox - FINE - this is exactly what I want to happen - EXCEPT - If I want to cancel the entire operation the cancel button on the forms events are not firing because the textbox validation code is running and because e.cancel is set to true until proper validation occurs the user cannot cancel or move on

[Hack]

Did you try the cancel boolean?

[Moonshot]

Did you try the cancel boolean?

Yeah - wouldn't work either - it seems that validation will not let any other events fire until it is satisfied - I verified this using msgboxs

VB2005 express btw - maybe its a bug?

[Tinbeard]

I've tested it with this code....

Public Class Form1
 
    Private Sub TextBox1_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox1.Validating
        e.Cancel = True
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If MessageBox.Show("Do you want to cancel", "Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = Windows.Forms.DialogResult.Yes Then
            Me.Close()
        End If
 
    End Sub
End Class

If I set the Cancel buttons CausesValidation to 'true' then I cannot close the form with the cancel button.
However if the CausesValidation is set to 'false' the form exits as expected.

So the fact that the textbox is validating is not the problem as the cancel button will prevent these events occuring when it's clicked.

[jmcilhinney]

Have you set the CausesValidation property of the Button to False or that of the TextBox? It is the BUTTON's CausesValidation property that needs to be set to False.

[Moonshot]

Have you set the CausesValidation property of the Button to False or that of the TextBox? It is the BUTTON's CausesValidation property that needs to be set to False.

Yeah I have - I'm using Devcomponents Dotnetbar Wizard control - Perhaps its a problem with their control

[Moonshot]

Have set every cause validation to false on the form / panels etc except two textboxes

Cancel button CAUSEVALIDATION set to False also

Still doesn't work - I'm at a loss here

[Moonshot]

If I press the escape button on the keyboard it allows the cancel button code to operate