Getting error referencing Hyperlink from code-behind

[John Kotuby]

Hi guys...
I must be going brain dead from working on this project for 80 hours in the
last week. I suppose that's part-time for some coders.. anyway...

I created a simple Hyperlink in a user control:

<asp:HyperLin k id="lnkRefine" runat="server" >Refine Search</asp:HyperLink>

In the code behind I am trying to set the NavigateURL depending upon a
condition. I include the entire Sub since it may reveal what I am doing
wrong:
----------------------------------------------
Protected Sub Page_PreRender( ByVal sender As Object, ByVal e As
System.EventArg s) Handles Me.PreRender
Dim lnkRefine As HyperLink = FindControl("ln kRefine")

If Not IsDBNull(lnkRef ine) Then
If strPassthru = "passthru" Then
lnkRefine.Navig ateUrl =
"~/Search/SearchDetail.as px?page=base&se archId=" & strSavedSearchI D
Else
lnkRefine.Navig ateUrl = "javascript:his tory.go(-1)"
End If
End If

End Sub
------------------------------------------------------

Since the code gets past the If Not IsDBNull(lnkRef ine) I assume (maybe
incorrectly) that the control was found and object reference instantiated.
On the line:

lnkRefine.Navig ateUrl = "~/Search/SearchDetail.as px?page=base&se archId=" &
strSavedSearchI D

I am getting the error:
Object reference not set to an instance of an object

Any help would be appreciated... thanks

[bruce barker]

Re: Getting error referencing Hyperlink from code-behind

IsDBNull checks is the passed object is the DBNull object. if pass it a
null, it will return true. IsDBNull should only be used database
datatype classes not general classes.

-- bruce (sqlwork.com)

John Kotuby wrote:

Hi guys...
I must be going brain dead from working on this project for 80 hours in the
last week. I suppose that's part-time for some coders.. anyway...
>
I created a simple Hyperlink in a user control:
>
<asp:HyperLin k id="lnkRefine" runat="server" >Refine Search</asp:HyperLink>
>
In the code behind I am trying to set the NavigateURL depending upon a
condition. I include the entire Sub since it may reveal what I am doing
wrong:
----------------------------------------------
Protected Sub Page_PreRender( ByVal sender As Object, ByVal e As
System.EventArg s) Handles Me.PreRender
Dim lnkRefine As HyperLink = FindControl("ln kRefine")
>
If Not IsDBNull(lnkRef ine) Then
If strPassthru = "passthru" Then
lnkRefine.Navig ateUrl =
"~/Search/SearchDetail.as px?page=base&se archId=" & strSavedSearchI D
Else
lnkRefine.Navig ateUrl = "javascript:his tory.go(-1)"
End If
End If
>
End Sub
------------------------------------------------------
>
Since the code gets past the If Not IsDBNull(lnkRef ine) I assume (maybe
incorrectly) that the control was found and object reference instantiated.
On the line:
>
lnkRefine.Navig ateUrl = "~/Search/SearchDetail.as px?page=base&se archId=" &
strSavedSearchI D
>
I am getting the error:
Object reference not set to an instance of an object
>
Any help would be appreciated... thanks
>
>
>

[John Kotuby]

Re: Getting error referencing Hyperlink from code-behind

Thanks Bruce...

I'd better not post anymore when I am brain-dead. In fact before the post I
was looking straight at an article that showed the syntax:

If Not (myControl Is Nothing) then ...

I guess I just have to find out why the control is not being found now.

Thanks again.

"bruce barker" <nospam@nospam. comwrote in message
news:%2379IeLnj HHA.4516@TK2MSF TNGP03.phx.gbl. ..

IsDBNull checks is the passed object is the DBNull object. if pass it a
null, it will return true. IsDBNull should only be used database datatype
classes not general classes.
>
-- bruce (sqlwork.com)
>
John Kotuby wrote:

>Hi guys...
>I must be going brain dead from working on this project for 80 hours in
>the last week. I suppose that's part-time for some coders.. anyway...
>>
>I created a simple Hyperlink in a user control:
>>
><asp:HyperLi nk id="lnkRefine" runat="server" >Refine
>Search</asp:HyperLink>
>>
>In the code behind I am trying to set the NavigateURL depending upon a
>condition. I include the entire Sub since it may reveal what I am doing
>wrong:
>----------------------------------------------
>Protected Sub Page_PreRender( ByVal sender As Object, ByVal e As
>System.EventAr gs) Handles Me.PreRender
>Dim lnkRefine As HyperLink = FindControl("ln kRefine")
>>
>If Not IsDBNull(lnkRef ine) Then
> If strPassthru = "passthru" Then
> lnkRefine.Navig ateUrl =
>"~/Search/SearchDetail.as px?page=base&se archId=" & strSavedSearchI D
> Else
> lnkRefine.Navig ateUrl = "javascript:his tory.go(-1)"
> End If
>End If
>>
>End Sub
>------------------------------------------------------
>>
>Since the code gets past the If Not IsDBNull(lnkRef ine) I assume (maybe
>incorrectly) that the control was found and object reference
>instantiated . On the line:
>>
>lnkRefine.Navi gateUrl = "~/Search/SearchDetail.as px?page=base&se archId="
>& strSavedSearchI D
>>
>I am getting the error:
>Object reference not set to an instance of an object
>>
>Any help would be appreciated... thanks
>>
>>