vb.net如何退出验证返回焦点到空文本框？

Question

I am working in vb.net and I want to exit a validation and return the focus to the textbox with the error.

it raises the error but as soon as I click ok, it continues with the rest of the program. Any idea's? thank you.

Should I also mention that this is in a class.

   'number of tickets property
Public Property NumberOfTickets() As String
    Get
        Return NumTickets
    End Get
    Set(value As String)
        If (String.IsNullOrEmpty(value)) Then
            MessageBox.Show("Please Enter Number of Tickets")
            Exit Property
        Else
            NumTickets = value
        End If
    End Set
End Property

Answer 1

You could use Validating event of your Textbox, and in that, say:

e.Cancel = True

This will prevent user from leaving the TextBox. However, this would also prevent user from closing the form, and performing any other action. Restricting users like that is considered bad practice by some.

Please consider using ErrorProvider instead and just notify user about the errors.

Always do your best to let them finish what they were doing.