windows form validation
- Thread starter sharc
- Start date
All windows forms are valid. Now, maybe if you were to give a proper explanation of what you really want, we may be able to help.
sorry 
I've got a form set up in windows, with text fields for names, dates, email addresses etc set up. ... before clicking on the submit button, I'd like to validate that the data that's trying to be submitted is in the proper format .. .. dates are dates, email addresses have no spaces, but have an @ sign etc.. . just like how it's done for web forms. .. .
so on click of the submit button, maybe if I could have an exclamation point come up near the field, or just some sort of alert that will inform the user what they've done wrong,and once these checks are satisfied, then the form will then be able to be submitted.
Can this be done? Please help!
I've got a form set up in windows, with text fields for names, dates, email addresses etc set up. ... before clicking on the submit button, I'd like to validate that the data that's trying to be submitted is in the proper format .. .. dates are dates, email addresses have no spaces, but have an @ sign etc.. . just like how it's done for web forms. .. .
so on click of the submit button, maybe if I could have an exclamation point come up near the field, or just some sort of alert that will inform the user what they've done wrong,and once these checks are satisfied, then the form will then be able to be submitted.
Can this be done? Please help!
Dates should not be an issue at all because you should be using DateTimePicker controls, which do the validation for you. To validate e-mail address format you should use a regular expression via a Regex object. There are numerous examples of patterns suitable for e-mail address validation on the Web. To indicate an invalid filed you should use an ErrorProvider component.
I would strongly recommend not waiting until the user presses the Submit button to validate. It always annoys me when I press a button and then get told I've done something wrong when I could have been told before. Do your validation as the user enters the data and don't even enable the Submit button until all the data is valid.
I would strongly recommend not waiting until the user presses the Submit button to validate. It always annoys me when I press a button and then get told I've done something wrong when I could have been told before. Do your validation as the user enters the data and don't even enable the Submit button until all the data is valid.
No, don't. Firstly, you should very, very rarely use the LostFocus event at all, as the documentation says. You should use the Leave event in preference. That said, validation should be performed on the Validating event.
blounty
Member
I did it by adding an error provider to my form from the tool box and in the validating event of the control i want to validate use something like this:
Hope this helped (or at least partially).
Alex
VB.NET:
Private Sub Address2Txt_Validating(ByVal sender As System.Object, _
ByVal e As System.ComponentModel.CancelEventArgs) _
Handles Address2Txt.Validating
If CType(sender, TextBox).Text = "" Then
ErrorProvider1.SetError(sender, _
"You must enter an invoice address line 2.")
Else
ErrorProvider1.SetError(sender, "")
End If
End SubHope this helped (or at least partially).
Alex
Last edited:
