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copied!<p>Why don't you use Linq extension <a href="http://msdn.microsoft.com/en-us/library/bb358497.aspx" rel="nofollow">Reverse()</a>? This can allow you to switch between ascending and descending without knowing the current sorting. If you want to use this, make sure you are referencing <code>System.Core</code> library and declaring a using directive with <code>System.Linq</code> on the top of your source file.</p> <p>Another way would be creating a class that inherits from List and modifying it a little bit like this:</p> <pre><code>public class LazyReversingList<T> : IList<T> { private Boolean m_SortedAscending; private List<T> m_InnerList; public Boolean IsReadOnly { get { return false; } } public Boolean SortedAscending { get { return m_SortedAscending; } } public Int32 Count { get { EnsureList(); return m_InnerList.Count; } } public T this[Int32 index] { get { EnsureList(); return m_InnerList[index]; } set { EnsureList(); m_InnerList[index] = value; } } private void EnsureList() { if (m_InnerList == null) m_InnerList = new List<T>(); } public Boolean Contains(T item) { EnsureList(); return m_InnerList.Contains(item); } public Boolean Remove(T item) { EnsureList(); return m_InnerList.Remove(item); } public IEnumerator<T> GetEnumerator() { EnsureList(); return m_InnerList.GetEnumerator(); } public Int32 IndexOf(T item) { EnsureList(); return m_InnerList.IndexOf(item); } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { EnsureList(); return m_InnerList.GetEnumerator(); } public void Add(T item) { EnsureList(); m_InnerList.Add(item); } public void Clear() { EnsureList(); m_InnerList.Clear(); } public void CopyTo(T[] array, Int32 arrayIndex) { EnsureList(); m_InnerList.CopyTo(array, arrayIndex); } public void Insert(Int32 index, T item) { EnsureList(); m_InnerList.Insert(index, item); } public void RemoveAt(Int32 index) { EnsureList(); m_InnerList.RemoveAt(index); } public void Reverse() { if (!m_SortedAscending) { m_InnerList.Sort((x, y) => String.CompareOrdinal(x.DisplayName, y.DisplayName)); m_SortedAscending = true; } else { m_InnerList.Sort((x, y) => (String.CompareOrdinal(x.DisplayName, y.DisplayName) * -1)); m_SortedAscending = false; } } } </code></pre>

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