close wpf user control in VB.net

Question

Hi Everyone I'm stuck on this issue please help. I created an user control named  CreateNewCase_uc within which I created a button Close named btnClose In my MainWindow I created a Grid named grid1 and a button Open named btnCreateNewCase with this code Private Sub btnCreateNewCase_Click ( sender As Object  e As RoutedEventArgs ) Dim cnc As CreateNewCase_uc = New CreateNewCase_uc grid1. Children . Clear ( ) grid1. Children . Add ( cnc ) End Sub My question : which Code I need to Write for my bntClose button which is inside the user control to close or make disappeared the user control in VB.NET Thanks in advance for your help.

Vulpes · Answer

Not sure about this but try: Private Sub btnClose_Click(sender As Object e As RoutedEventArgs) Dim g As Grid = CType(Me.Parent Grid) If g.Children.Count > 0 Then g.Children.RemoveAt(0) End If End Sub

Vulpes · Answer

Well we know that the parent of your UserControl is a Grid but the Parent property of a UserControl returns a DependencyObject which is one of the ancestor classes of the Grid class. So the first thing we need to do to get back to the Grid is to convert the DependencyObject to Grid which is what CType(Me.Parent Grid) does. Having done that then a reference to the UserControl will be held in the Grid's Children collection. I noticed that you'd cleared this collection before adding the UserControl and so the latter must be held at index 0 of the Children collection even if you've added further controls to the Grid. So having made sure that the Children collection hasn't been cleared in the meantime (its Count property is greater than zero) we just need to remove the item at index 0 of the collection which is what g.Children.RemoveAt(0) does.

William EKE · Answer

Hi Vulpes Sure It works Thanks a lot. I want to understand a little. what does the Ctype Function and Children.Count and lastly Children.RemoveAt(i) I want to understand in order to use these Functions after if necessary. And once again Thanks a lot