Access child element in nested repeaters (ASP.NET/C#)

Posted on 2004-09-21
Last Modified: 2011-04-14

I have a page displaying bookmarks stored in a database, and organised in categories. The output has this form:

General bookmarks


Funny stuff

I am displaying a checkbox next to each bookmark, and at the bottom of the list I have a delete button that should delete the bookmarks that have been checked by the user. The bookmarks and the categories are displayed using nested repeaters (where, naturally, the bookmarks are the child elements). When the button is clicked, it triggers an event that loops through the elements in the repeater, but I cant get it to loop through the child elements - only the parent (categories). The below code works fine for the parent elements (by using "parentrepeater" instead of "childrepeater")

for (int i = 0; i < childrepeater.Items.Count; i++) // error comes here - childrepeater seems to be unaccessible
      CheckBox CurrentCheckBox = new CheckBox();
      CurrentCheckBox = (CheckBox) childrepeater.Items[i].FindControl("Checkbox1");

      if (CurrentCheckBox.Checked)
      // delete bookmark

But even though this code compiles, I get "Object reference not set to an instance of an object". The childrepeater is not initialised/instansiated, even though it's drawn on screen.

Anyone have an idea here? How do I access child elements in nested repeaters?

Question by:UncleAndy
  • 2

Expert Comment

ID: 12112229

Accepted Solution

netjkus earned 300 total points
ID: 12112244
                      Repeater nestedRepeater = e.Item.FindControl("NestedRepeater")  as Repeater;
                        if(nestedRepeater != null)
                            nestedRepeater.DataSource =     dv.CreateChildView("CustomerOrders");

Author Comment

ID: 12112549

Oh yes, there we go! Still a couple of issues I have to work out, but your tip helped me figure out how to get access to the child repeater. For others with a similar problem, here is my code:

// in the method triggered by the delete button
for (int i = 0; i < parentrepeater.Items.Count; i++)
      Repeater nestedRepeater = parentrepeater.Items[i].FindControl("childrepeater") as Repeater;

      for (int y = 0; y < nestedRepeater.Items.Count; y++)
            CheckBox CurrentCheckBox = new CheckBox();
            CurrentCheckBox = (CheckBox) nestedRepeater.Items[y].FindControl("Checkbox1");

            if (CurrentCheckBox.Checked)
                  // delete bokmark

Thanks, netjkus! Problem solved within an hour!


Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Replacing HTML tags in Textarea/Textbox 5 47 Object not set to an instance of an object 4 33
Achieve json result 2 65
Host pages 5 25
AJAX ModalPopupExtender has a required property "TargetControlID" which may seem to be very confusing to new users. It means the server control that will be extended by the ModalPopup, for instance, if when you click a button, a ModalPopup displays,…
In this Article, I will provide a few tips in problem and solution manner. Opening an ASPX page in Visual studio 2003 is very slow. To make it fast, please do follow below steps:   Open the Solution/Project. Right click the ASPX file to b…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now