Cross Postback from Masterpage

Question

I have a textbox used to search for products. This textbox is placed in the site's masterpage. However, I'm getting a null error for the frmSearch value once posted back.

masterpage search:

<asp:TextBox ID="frmSearch" runat="server" CssClass="searchbox"></asp:TextBox>
<asp:LinkButton ID="searchGo" CssClass="searchbutton" PostBackUrl="search.aspx"  runat="server">GO</asp:LinkButton>

search.aspx pageload:

if (PreviousPage != null && PreviousPage.IsCrossPagePostBack)
        {
            Page previousPage = PreviousPage;
            TextBox tbSearch = (TextBox)PreviousPage.FindControl("frmSearch");
            searchValue.Text = for tbSearch.Text;
        }

Where am I going wrong?

Tried using a lowercase tag for id? i.e. ` – Polynomial Oct 04 '11 at 22:54 — Polynomial, Oct 04 '11 at 22:54

score 3 · Accepted Answer · answered Oct 04 '11 at 23:41

3

frmSearch doesn't exist on your PreviousPage. It exists on the Master page of PreviousPage.

If you change the following line to include .Master, it should pull that text box.

TextBox tbSearch = (TextBox)PreviousPage.Master.FindControl("frmSearch");

answered Oct 04 '11 at 23:41

Doozer Blake

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Thank you! One day I might just get to grips with this .net thing! – ComfortablyNumb Oct 05 '11 at 07:45

Cross Postback from Masterpage

1 Answers1