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copied!<p>Improving on the good solution by Hans Passant I decided to write an extension method based on his solution and adding other stuff as well. I am surprised that even in .NET 4 this basic functionality hasn't been fixed.</p> <ul> <li>Implemented it as an Extension Method that can be reused in a more transparent manner</li> <li>The clean up method only cleans up the pages of the control being disposed/cleaned up.</li> <li>Whenever possible the tab page is restored to its same position. This isn't always possible if you hide/show several tab pages.</li> <li>It does some error and parameter checking</li> <li>To make it invisible it finds out its parent. When making visible it has to be given because the Parent property is null when the tab page has been removed.</li> </ul> <p><br/> </p> <pre><code>public static class TabPageExtensions { private struct TabPageData { internal int Index; internal TabControl Parent; internal TabPage Page; internal TabPageData(int index, TabControl parent, TabPage page) { Index = index; Parent = parent; Page = page; } internal static string GetKey(TabControl tabCtrl, TabPage tabPage) { string key = ""; if (tabCtrl != null && tabPage != null) { key = String.Format("{0}:{1}", tabCtrl.Name, tabPage.Name); } return key; } } private static Dictionary<string, TabPageData> hiddenPages = new Dictionary<string, TabPageData>(); public static void SetVisible(this TabPage page, TabControl parent) { if (parent != null && !parent.IsDisposed) { TabPageData tpinfo; string key = TabPageData.GetKey(parent, page); if (hiddenPages.ContainsKey(key)) { tpinfo = hiddenPages[key]; if (tpinfo.Index < parent.TabPages.Count) parent.TabPages.Insert(tpinfo.Index, tpinfo.Page); // add the page in the same position it had else parent.TabPages.Add(tpinfo.Page); hiddenPages.Remove(key); } } } public static void SetInvisible(this TabPage page) { if (IsVisible(page)) { TabControl tabCtrl = (TabControl)page.Parent; TabPageData tpinfo; tpinfo = new TabPageData(tabCtrl.TabPages.IndexOf(page), tabCtrl, page); tabCtrl.TabPages.Remove(page); hiddenPages.Add(TabPageData.GetKey(tabCtrl, page), tpinfo); } } public static bool IsVisible(this TabPage page) { return page != null && page.Parent != null; // when Parent is null the tab page does not belong to any container } public static void CleanUpHiddenPages(this TabPage page) { foreach (TabPageData info in hiddenPages.Values) { if (info.Parent != null && info.Parent.Equals((TabControl)page.Parent)) info.Page.Dispose(); } } } </code></pre>

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