Master Pages, Themes and Navigation Controls

Re: FindControl() doesn't work if page has MasterPage

singhshash@gmail.com — Wed, 17 Oct 2007 14:53:43 GMT

Brilliant Man, you saved me a lot of time with show me how to use master.findcontrol stuff. brilliant.....................

Re: FindControl() doesn't work if page has MasterPage

Eric Fettman — Wed, 23 Aug 2006 18:16:13 GMT

I found a solution:

http://west-wind.com/weblog/posts/5127.aspx

Thanks, Rick Strahl.

All I had to change was:

ControlUtils

.PopulateDD(this.Master.FindControl("ContentPlaceHolder1"), dropDowns);

and also the signature of the method so it accepts all Control objects and not just Page objects:

public

static void PopulateDD(Control container, List<string> dropDowns)

Re: FindControl() doesn't work if page has MasterPage

Eric Fettman — Wed, 23 Aug 2006 10:53:43 GMT

Thanks for your response.

The controls that I'm populating with XML are not in the MasterPage, so I don't think that this is going to work.

Any other ideas?

Re: FindControl() doesn't work if page has MasterPage

lostlander — Wed, 23 Aug 2006 03:19:01 GMT

Use Page.Master.FindControl instead.

FindControl() doesn't work if page has MasterPage

Eric Fettman — Tue, 22 Aug 2006 21:30:44 GMT

Hi, Folks --

I'm using the following C# static method to populate some DropDownLists from XML files:

public

static void PopulateDD(Page page, List<string> dropDowns)

{

DataSet ds = new DataSet();

DropDownList select;

foreach (string dropDown in dropDowns)

{

select = (

DropDownList)page.FindControl("dd"+dropDown);

ds.ReadXml(page.Server.MapPath(

"~/xml/"+dropDown+".xml"));

select.DataSource = ds;

select.DataTextField =

"text";

select.DataValueField =

"text";

select.DataBind();

ds.Clear();

}

I'm calling the method from a code-behind page as follows:

List

<string> dropDowns = new List<string>();

dropDowns.Add(

"State");

dropDowns.Add(

"Country");

dropDowns.Add(

"Industry");

ControlUtils.PopulateDD(this.Page, dropDowns);

This is the problem: the method returns a NullReferenceException if I call it from a page that has a MasterPage because FindControl is not returning anything. This is a problem ONLY if the page is associated with a MasterPage.

Any thoughts appreciated.

TIA,

Eric