Not TypeOf ctrl Is RadioButtonList

Question

User-944424728 posted

Hello, the code below is postback if it's not a radiobuttonlist. I added "Or Not TypeOf ctrl Is CheckBoxList"  but it's not working like radiobuttonlist. Can you advise what is missing? thank you. "If Not TypeOf ctrl Is RadioButtonList Or Not TypeOf ctrl Is CheckBoxList" .

--

below postback is working if not radiobuttonlist

Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender

        If Page.IsPostBack Then

            Dim ctrl As Control = GetPostbackControl()

            If Not TypeOf ctrl Is RadioButtonList Then

                GetPostbackControl.Focus()

 

            End If

        End If

Answer 1

User409696431 posted

Did you mean "and", not "or"?

The condition "not checkboxlist or not radiobuttonlist" will be true for a checkboxlist (it's not a radiobuttonlist), true for a radiobuttonlist (it's not a checkboxlist) and true for any other control (it's not a checkboxlist, it's not a radiobuttonlist).  Every postback control will get focus.

Do you want the control to get focus if it's not a checkboxlist and it is also not a radiobuttonlist?  In that case you'd use  if not checkboxlist AND not radiobuttonlist.

Answer 2

User-944424728 posted

Hello you mean "

If Not TypeOf ctrl Is RadioButtonList or not checkboxlist Then

                GetPostbackControl.Focus()

?? I think it has syntax error. thanks.

Answer 3

User409696431 posted

 I am not showing you the VB code, just the pseudo code logic.  You can write the code yourself.

My point is that using an OR between your two NOT conditions will mean that test passes everything, so there is no point to having a condition at all.   I assume you meant to use AND in your condition.