problem with FindControl

15 Feb 2007 8:37 AM

Terry

Hi,

i want to access control "TextBox1" embedded in another control "LoginView1"
in order to change the 'Text' of the textbox.

Therefore i use 'FindControl' method but i get error:
"Object reference not set to an instance of an object" on line: tb =
lv.FindControl("textbox1")

Thanks for help
Cliff

aspx:
----
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<table>
<asp:LoginView ID="LoginView1" runat="server">
<LoggedInTemplate>
<fieldset style="height: 425px; width: 335px;">
<tr><td>
<asp:TextBox ID="TextBox1" runat="server" Text=""></asp:TextBox>
</td></tr>
</fieldset>
</LoggedInTemplate>
</asp:LoginView>
</table>
</asp:Content>

code-behind:
-----------
Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Me.Load
Dim lv As LoginView
                Dim tb As TextBox
                lv = FindControl("loginview1")
                tb = lv.FindControl("textbox1")
                tb.Text = "ok"
end sub

15 Feb 2007 9:28 AM

Teemu Keiski

If you are running this on the content page, you don't need tom FindControl
the LoginView. You can just

Dim tb As TextBox
tb = Me.LoginView1.FindControl("textbox1")
tb.Text = "ok"

--
Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

Show quoteHide quote

"Terry" <n*@mail.pr> wrote in message
news:eUnDZyNUHHA.4668@TK2MSFTNGP04.phx.gbl...
> Hi,
>
> i want to access control "TextBox1" embedded in another control
> "LoginView1" in order to change the 'Text' of the textbox.
>
> Therefore i use 'FindControl' method but i get error:
> "Object reference not set to an instance of an object" on line: tb =
> lv.FindControl("textbox1")
>
>
> Thanks for help
> Cliff
>
>
> aspx:
> ----
> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
> Runat="Server">
> <table>
> <asp:LoginView ID="LoginView1" runat="server">
> <LoggedInTemplate>
> <fieldset style="height: 425px; width: 335px;">
> <tr><td>
> <asp:TextBox ID="TextBox1" runat="server" Text=""></asp:TextBox>
> </td></tr>
> </fieldset>
> </LoggedInTemplate>
> </asp:LoginView>
> </table>
> </asp:Content>
>
> code-behind:
> -----------
> Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
> Handles Me.Load
> Dim lv As LoginView
>                Dim tb As TextBox
>                lv = FindControl("loginview1")
>                tb = lv.FindControl("textbox1")
>                tb.Text = "ok"
> end sub
>
>
>

15 Feb 2007 10:02 AM

Terry

Thanks, it works indeed ...
Maybe you can also help me with the other problem in the thread above "how
to trigger .."?

Show quoteHide quote

"Teemu Keiski" <jot***@aspalliance.com> schreef in bericht
news:F71CEBC9-B5A2-4BFA-819C-A88BB87BE5EA@microsoft.com...
> If you are running this on the content page, you don't need tom
> FindControl the LoginView. You can just
>
> Dim tb As TextBox
> tb = Me.LoginView1.FindControl("textbox1")
> tb.Text = "ok"
>
> --
> Teemu Keiski
> AspInsider, ASP.NET MVP
> http://blogs.aspadvice.com/joteke
> http://teemukeiski.net
>
>
>
>
>
> "Terry" <n*@mail.pr> wrote in message
> news:eUnDZyNUHHA.4668@TK2MSFTNGP04.phx.gbl...
>> Hi,
>>
>> i want to access control "TextBox1" embedded in another control
>> "LoginView1" in order to change the 'Text' of the textbox.
>>
>> Therefore i use 'FindControl' method but i get error:
>> "Object reference not set to an instance of an object" on line: tb =
>> lv.FindControl("textbox1")
>>
>>
>> Thanks for help
>> Cliff
>>
>>
>> aspx:
>> ----
>> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
>> Runat="Server">
>> <table>
>> <asp:LoginView ID="LoginView1" runat="server">
>> <LoggedInTemplate>
>> <fieldset style="height: 425px; width: 335px;">
>> <tr><td>
>> <asp:TextBox ID="TextBox1" runat="server" Text=""></asp:TextBox>
>> </td></tr>
>> </fieldset>
>> </LoggedInTemplate>
>> </asp:LoginView>
>> </table>
>> </asp:Content>
>>
>> code-behind:
>> -----------
>> Private Sub Page_Load(ByVal sender As Object, ByVal e As
>> System.EventArgs) Handles Me.Load
>> Dim lv As LoginView
>>                Dim tb As TextBox
>>                lv = FindControl("loginview1")
>>                tb = lv.FindControl("textbox1")
>>                tb.Text = "ok"
>> end sub
>>
>>
>>
>