The following example overrides the RenderChildren method in a custom server control. It determines whether the current control has any child controls in its ControlCollection object. If it does, it uses the Count property to iterate through the collection. As it encounters each child control, it uses the RenderControl method to render the parent control, and all of its child controls, to the containing page.
The overridden Render method then calls the overridden RenderChildren method.
' Override default implementation to Render children according to needs.
Protected Overrides Sub RenderChildren(output As HtmlTextWriter)
If HasControls() Then
' Render Children in reverse order.
Dim i As Integer
For i = Controls.Count - 1 To 0 Step -1
End Sub 'RenderChildren
Protected Overrides Sub Render(output As HtmlTextWriter)
output.Write(("<br>Message from Control : " + Message))
output.Write(("Showing Custom controls created in reverse" + "order"))
' Render Controls.