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findcontrol in listview

Posted on 2011-10-02
Medium Priority
Last Modified: 2013-12-16

I use a masterpage.

In my content (default.aspx), I want to find the hyperlink control for a certain page - etc. frontpage.
Frontpage is in this listview:
 <asp:ListView ID="lvMenu" runat="server" DataSourceID="dsKategorier">

This dosen´t work, I dont understand:
 HyperLink textBox = (HyperLink)Master.lvMenu.FindControl("TaxFileIDTextBox");
Question by:bongii
LVL 18

Accepted Solution

Matthew Kelly earned 2000 total points
ID: 36900708
You will have to FindControl on a ListViewDataItem instead of FindControl on the entire ListView. See the code section below:
Loop through all rows:

foreach (ListViewDataItem currentItem in lvMenu)
  HyperLink hp = (HyperLink)currentItem.FindControl("TaxFileIDTextBox");

Or for a single row (where the ID is known):

HyperLink hp = (HyperLink)lvMenu.Items[2].FindControl("TaxFileIDTextBox");

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LVL 36

Expert Comment

by:Miguel Oz
ID: 36900752
If the list view is in ContentPlaceHolder, you should try:
    ContentPlaceHolder mpContentPlaceHolder;
    TextBox mpTextBox;
    mpContentPlaceHolder =
    if(mpContentPlaceHolder != null)
        mpTextBox =
            (TextBox) mpContentPlaceHolder.FindControl("TextBox1");
        if(mpTextBox != null)
            mpTextBox.Text = "TextBox found!";


Notice that this only works for static elements that are defined on your page. If you are filling up the list view with dynamic content, it depends where the controls are atteched and how page state is managed


Author Comment

ID: 36902528

HyperLink hp = (HyperLink)lvMenu.Items[2].FindControl("TaxFileIDTextBox");

This dosen´t work. LvMenu can´t be found. It on the master page?

Expert Comment

ID: 36908223
FindControl only searches amongst the controls that are immediate children of the container.
If we write lvMenu.FindControl("TaxFileIDTextBox") then it will check whether any of the immediate child controls of lvMenu has ID = TaxFileIDTextBox or not. If one is found then that control's reference will be returned otherwise it will return null. Please remember FindControl does not search throughout a hierarchy of controls within controls. See more.

So in your code see which control is the immediate parent of "TaxFileIDTextBox". Is it lvMenu? It won't be.
So you will have to first do FindControl to reach that parent.

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