diff --git a/CSharp/Libraries/UniversalEditor.Core/Accessor.cs b/CSharp/Libraries/UniversalEditor.Core/Accessor.cs
index a7342b0d..9cb3a1bc 100644
--- a/CSharp/Libraries/UniversalEditor.Core/Accessor.cs
+++ b/CSharp/Libraries/UniversalEditor.Core/Accessor.cs
@@ -47,8 +47,23 @@ namespace UniversalEditor
         private bool mvarIsOpen = false;
         public bool IsOpen { get { return mvarIsOpen; } protected set { mvarIsOpen = value; } }
 
-        public abstract void Open();
-        public abstract void Close();
+        public void Open()
+        {
+            if (mvarIsOpen) return;
+
+            OpenInternal();
+            mvarIsOpen = true;
+        }
+        public void Close()
+        {
+            if (!mvarIsOpen) return;
+
+            CloseInternal();
+            mvarIsOpen = false;
+        }
+
+        protected abstract void OpenInternal();
+        protected abstract void CloseInternal();
 
         private Encoding mvarDefaultEncoding = Encoding.Default;
         /// <summary>
diff --git a/CSharp/Libraries/UniversalEditor.Core/Accessors/FileAccessor.cs b/CSharp/Libraries/UniversalEditor.Core/Accessors/FileAccessor.cs
index 515019e3..9e9442ab 100644
--- a/CSharp/Libraries/UniversalEditor.Core/Accessors/FileAccessor.cs
+++ b/CSharp/Libraries/UniversalEditor.Core/Accessors/FileAccessor.cs
@@ -88,9 +88,9 @@ namespace UniversalEditor.Accessors
         public void Open(string FileName)
         {
             mvarFileName = FileName;
-            Open();
+            OpenInternal();
         }
-        public override void Open()
+        protected override void OpenInternal()
         {
             System.IO.FileShare share = System.IO.FileShare.Read;
             System.IO.FileMode mode = System.IO.FileMode.OpenOrCreate;
@@ -106,7 +106,7 @@ namespace UniversalEditor.Accessors
             mvarFileStream = System.IO.File.Open(mvarFileName, mode, access, share);
         }
 
-        public override void Close()
+        protected override void CloseInternal()
         {
             mvarFileStream.Close();
         }
diff --git a/CSharp/Libraries/UniversalEditor.Core/Accessors/MemoryAccessor.cs b/CSharp/Libraries/UniversalEditor.Core/Accessors/MemoryAccessor.cs
index 52206bc7..6f2b4346 100644
--- a/CSharp/Libraries/UniversalEditor.Core/Accessors/MemoryAccessor.cs
+++ b/CSharp/Libraries/UniversalEditor.Core/Accessors/MemoryAccessor.cs
@@ -88,14 +88,11 @@ namespace UniversalEditor.Accessors
 			return count;
 		}
 
-		public override void Open()
+        protected override void OpenInternal()
 		{
-			IsOpen = true;
 		}
-
-		public override void Close()
+        protected override void CloseInternal()
 		{
-			IsOpen = false;
 		}
 	}
 }
diff --git a/CSharp/Libraries/UniversalEditor.Core/Accessors/StreamAccessor.cs b/CSharp/Libraries/UniversalEditor.Core/Accessors/StreamAccessor.cs
index 7d6f7438..990c958d 100644
--- a/CSharp/Libraries/UniversalEditor.Core/Accessors/StreamAccessor.cs
+++ b/CSharp/Libraries/UniversalEditor.Core/Accessors/StreamAccessor.cs
@@ -65,14 +65,11 @@ namespace UniversalEditor.Accessors
             return count;
 		}
 
-		public override void Open()
+		protected override void OpenInternal()
 		{
-			throw new NotImplementedException();
 		}
-
-		public override void Close()
+        protected override void CloseInternal()
 		{
-			mvarBaseStream.Close();
 		}
 	}
 }
diff --git a/CSharp/Libraries/UniversalEditor.Core/Accessors/StringAccessor.cs b/CSharp/Libraries/UniversalEditor.Core/Accessors/StringAccessor.cs
index 5f79e71e..74b7ff30 100644
--- a/CSharp/Libraries/UniversalEditor.Core/Accessors/StringAccessor.cs
+++ b/CSharp/Libraries/UniversalEditor.Core/Accessors/StringAccessor.cs
@@ -98,14 +98,11 @@ namespace UniversalEditor.Accessors
 			return count;
 		}
 
-		public override void Open()
+        protected override void OpenInternal()
 		{
-			IsOpen = true;
 		}
-
-		public override void Close()
+        protected override void CloseInternal()
 		{
-			IsOpen = false;
 		}
 	}
 }