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copied!<p>Your first example is doing one level of recursion, so you're getting TextBoxes that are more than one control deep in the control tree. The second example only gets top-level TextBoxes (which you likely have few or none).</p> <p>The key here is that the <code>Controls</code> collection is not every control on the page - rather, it is only the <strong>immediate child controls</strong> of the current control (and a <code>Page</code> is a type of <code>Control</code>). <em>Those</em> controls may in turn have child controls of their own. To learn more about this, read about the <a href="http://aspalliance.com/943" rel="noreferrer">ASP.NET Control Tree here</a> and about <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.inamingcontainer.aspx" rel="noreferrer">NamingContainers here</a>. To truly get every TextBox anywhere on the page, you need a recursive method, like this:</p> <pre><code>public static IEnumerable<T> FindControls<T>(this Control control, bool recurse) where T : Control { List<T> found = new List<T>(); Action<Control> search = null; search = ctrl => { foreach (Control child in ctrl.Controls) { if (typeof(T).IsAssignableFrom(child.GetType())) { found.Add((T)child); } if (recurse) { search(child); } } }; search(control); return found; } </code></pre> <p>Which is used as an <a href="http://msdn.microsoft.com/en-us/library/bb383977.aspx" rel="noreferrer">extension method</a>, like so:</p> <pre><code>var allTextBoxes = this.Page.FindControls<TextBox>(true); </code></pre>

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