convert VB to C#

Pilz.Collections/SimpleHistory/SimpleHistory.cs

@@ -0,0 +1,104 @@
+using System.Collections.Generic;
+using Microsoft.VisualBasic.CompilerServices;
+
+namespace Pilz.Collections.SimpleHistory
+{
+    public class HistoryStack
+    {
+        private Stack<HistoryPoint> stackPast = new Stack<HistoryPoint>();
+        private Stack<HistoryPoint> stackFuture = new Stack<HistoryPoint>();
+
+        /// <summary>
+        /// Gets the count of history points.
+        /// </summary>
+        /// <returns></returns>
+        public bool ChangesCount
+        {
+            get
+            {
+                return Conversions.ToBoolean(stackPast.Count);
+            }
+        }
+
+        /// <summary>
+        /// Checks if the History has past changes.
+        /// </summary>
+        /// <returns></returns>
+        public bool HasChanges()
+        {
+            return stackPast.Count > 0;
+        }
+
+        /// <summary>
+        /// Patch Object States and call Undo Actions.
+        /// </summary>
+        public HistoryPoint Undo()
+        {
+            HistoryPoint ret;
+            if (stackPast.Count > 0)
+            {
+                var hp = stackPast.Pop();
+                hp.Undo();
+                stackFuture.Push(hp);
+                ret = hp;
+            }
+            else
+            {
+                ret = null;
+            }
+
+            return ret;
+        }
+
+        /// <summary>
+        /// Patch Object States and call Redo Actions.
+        /// </summary>
+        public HistoryPoint Redo()
+        {
+            HistoryPoint ret;
+            if (stackFuture.Count > 0)
+            {
+                var hp = stackFuture.Pop();
+                hp.Redo();
+                stackPast.Push(hp);
+                ret = hp;
+            }
+            else
+            {
+                ret = null;
+            }
+
+            return ret;
+        }
+
+        /// <summary>
+        /// Clear the History.
+        /// </summary>
+        public void Clear()
+        {
+            stackPast.Clear();
+            stackFuture.Clear();
+        }
+
+        /// <summary>
+        /// Store a History Point.
+        /// </summary>
+        /// <param name="point">The History Point to add to the past changes.</param>
+        /// <param name="newName">The name to set for the History Point.</param>
+        public void Store(HistoryPoint point, string newName)
+        {
+            point.Name = newName;
+            Store(point);
+        }
+
+        /// <summary>
+        /// Store a History Point.
+        /// </summary>
+        /// <param name="point">The History Point to add to the past changes.</param>
+        public void Store(HistoryPoint point)
+        {
+            stackPast.Push(point);
+            stackFuture.Clear();
+        }
+    }
+}