Hi,

Sometimes one may need to get a list of child controls inside specific container and don't care about the underlying hierarchy.

The result is beautifully achieved using this extension method:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;

 public static class ControlCollectionExtensionMethods
    {
        public static IEnumerable<Control> FlattenedList(this ControlCollection controls)
        {
            foreach (Control ctrl in controls)
            {
                  // return parent control
                   yield return ctrl;
           

                  // and dive into child collection
                   foreach (Control child in ctrl.Controls.FlattenedList())
                         yield return child;
            }
        }
    }

P.S.: don't forget about namespaces when using it in your code, if above class is wrapped into namespace, for example: Sample, the source code file with calling code must explicitly reference it: using Sample;