diff --git a/Aspects/Diagnostics/ExternalMetadata/WebExceptionDumpMetadata.cs b/Aspects/Diagnostics/ExternalMetadata/WebExceptionDumpMetadata.cs
index 5755e88..b8aa04a 100644
--- a/Aspects/Diagnostics/ExternalMetadata/WebExceptionDumpMetadata.cs
+++ b/Aspects/Diagnostics/ExternalMetadata/WebExceptionDumpMetadata.cs
@@ -1,4 +1,6 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.Contracts;
 using System.IO;
 using System.Net;
 
@@ -9,16 +11,19 @@ public abstract class WebExceptionDumpMetadata
     {
         /// <remarks/>
         [Dump(0)]
-        public object Status;
+        public object Status { get; set; }
 
         /// <remarks/>
         [Dump(1, DumpClass = typeof(WebExceptionDumpMetadata), DumpMethod = nameof(DumpResponse))]
-        public object Response;
+        public object Response { get; set; }
 
         /// <remarks/>
+        [SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
         public static string DumpResponse(
             WebResponse response)
         {
+            Contract.Ensures(Contract.Result<string>() != null);
+
             var stream = response?.GetResponseStream();
 
             if (stream == null)
diff --git a/Aspects/Diagnostics/NuGet/PublishObjectDumper.cmd b/Aspects/Diagnostics/NuGet/PublishObjectDumper.cmd
index c526344..bdb823e 100644
--- a/Aspects/Diagnostics/NuGet/PublishObjectDumper.cmd
+++ b/Aspects/Diagnostics/NuGet/PublishObjectDumper.cmd
@@ -12,7 +12,7 @@ if not exist c:\NuGet md c:\NuGet
 copy /y *.nupkg c:\NuGet
 @echo Press any key to push to NuGet.org... > con:
 @pause > nul:
-NuGet Push AspectObjectDumper.1.5.5.nupkg -source https://www.nuget.org/api/v2/
+NuGet Push AspectObjectDumper.1.5.5.nupkg -source https://www.nuget.org
 :exit
 popd
 pause
\ No newline at end of file
diff --git a/Aspects/Linq/Expressions/Serialization/NuGet/ExpressionSerialization.nuspec b/Aspects/Linq/Expressions/Serialization/NuGet/ExpressionSerialization.nuspec
index b4b3c17..6eda703 100644
--- a/Aspects/Linq/Expressions/Serialization/NuGet/ExpressionSerialization.nuspec
+++ b/Aspects/Linq/Expressions/Serialization/NuGet/ExpressionSerialization.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
     <metadata>
         <id>AspectExpressionSerialization</id>
-        <version>1.0.50</version>
+        <version>1.0.51</version>
         <authors>Val Melamed</authors>
         <owners>Val Melamed</owners>
         <summary>
diff --git a/Aspects/Linq/Expressions/Serialization/Properties/AssemblyInfo.cs b/Aspects/Linq/Expressions/Serialization/Properties/AssemblyInfo.cs
index 033f0cf..135e2c3 100644
--- a/Aspects/Linq/Expressions/Serialization/Properties/AssemblyInfo.cs
+++ b/Aspects/Linq/Expressions/Serialization/Properties/AssemblyInfo.cs
@@ -4,9 +4,9 @@
 [assembly: AssemblyTitle("vm.Aspects.Linq.Expressions.Serialization")]
 [assembly: AssemblyDescription("Serializes and deserializes LINQ expression trees to and from XML documents.")]
 
-[assembly: AssemblyVersion("1.0.50")]
-[assembly: AssemblyFileVersion("1.0.50")]
-[assembly: AssemblyInformationalVersion("1.0.50")]
+[assembly: AssemblyVersion("1.0.51")]
+[assembly: AssemblyFileVersion("1.0.51")]
+[assembly: AssemblyInformationalVersion("1.0.51")]
 
 [assembly: InternalsVisibleTo(
     "vm.Aspects.Linq.Expressions.Serialization.Test, " +
diff --git a/Aspects/Model/EFRepository/EFRepositoryBase.cs b/Aspects/Model/EFRepository/EFRepositoryBase.cs
index baf96bc..cf4fbbd 100644
--- a/Aspects/Model/EFRepository/EFRepositoryBase.cs
+++ b/Aspects/Model/EFRepository/EFRepositoryBase.cs
@@ -320,6 +320,7 @@ IList<DbValidationError> ToValidationErrors(
         /// is by this context or ownership was passed to this context when this context was created.
         /// </summary>
         /// <param name="disposing"><see langword="true"/> to release both managed and unmanaged resources; <see langword="false"/> to release only unmanaged resources.</param>
+        [SuppressMessage("Microsoft.Usage", "CA2215:Dispose methods should call base class dispose")]
         protected override void Dispose(
             bool disposing)
         {
diff --git a/Aspects/Model/PerCallContextRepositoryCallHandler.cs b/Aspects/Model/PerCallContextRepositoryCallHandler.cs
index 86c523a..9bdc08c 100644
--- a/Aspects/Model/PerCallContextRepositoryCallHandler.cs
+++ b/Aspects/Model/PerCallContextRepositoryCallHandler.cs
@@ -72,6 +72,7 @@ public IMethodReturn Invoke(
 
         #endregion
 
+        [SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Justification = "The scope will be disposed in PostInvoke.")]
         void PreInvoke(IMethodInvocation input)
         {
             if (!CreateTransactionScopeForTasks)
@@ -92,7 +93,7 @@ void PreInvoke(IMethodInvocation input)
             input.InvocationContext["transactionScope"] = scope;
         }
 
-        IMethodReturn DoInvoke(
+        static IMethodReturn DoInvoke(
             IMethodInvocation input,
             GetNextHandlerDelegate getNext) => getNext().Invoke(input, getNext);
 
diff --git a/Aspects/Model/Properties/AssemblyInfo.cs b/Aspects/Model/Properties/AssemblyInfo.cs
index a3334e7..d6abf84 100644
--- a/Aspects/Model/Properties/AssemblyInfo.cs
+++ b/Aspects/Model/Properties/AssemblyInfo.cs
@@ -3,9 +3,9 @@
 [assembly: AssemblyTitle("vm.Aspect.Model")]
 [assembly: AssemblyDescription("Defines the IRepository and related base classes and utilities - a framework of building domain object model.")]
 
-[assembly: AssemblyVersion("1.0.50")]
-[assembly: AssemblyFileVersion("1.0.50")]
-[assembly: AssemblyInformationalVersion("1.0.50")]
+[assembly: AssemblyVersion("1.0.51")]
+[assembly: AssemblyFileVersion("1.0.51")]
+[assembly: AssemblyInformationalVersion("1.0.51")]
 
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo(
     "vm.Aspects.Model.Tests, " +
diff --git a/Aspects/NuGet/PublishAspects.cmd b/Aspects/NuGet/PublishAspects.cmd
index e7d7455..d290d32 100644
--- a/Aspects/NuGet/PublishAspects.cmd
+++ b/Aspects/NuGet/PublishAspects.cmd
@@ -19,7 +19,7 @@ if not exist c:\NuGet md c:\NuGet
 copy /y *.nupkg c:\NuGet
 @echo Press any key to push to NuGet.org... > con:
 @pause > nul:
-NuGet Push vm.Aspects.1.0.50-beta.nupkg
+NuGet Push vm.Aspects.1.0.51-beta.nupkg -source https://www.nuget.org 
 :exit
 popd
 pause
\ No newline at end of file
diff --git a/Aspects/NuGet/vm.Aspects.nuspec b/Aspects/NuGet/vm.Aspects.nuspec
index 7fc25a5..49b5cb9 100644
--- a/Aspects/NuGet/vm.Aspects.nuspec
+++ b/Aspects/NuGet/vm.Aspects.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
     <metadata>
         <id>vm.Aspects</id>
-        <version>1.0.50-beta</version>
+        <version>1.0.51-beta</version>
         <authors>Val Melamed</authors>
         <owners>Val Melamed</owners>
         <summary>
diff --git a/Aspects/Parsers/Properties/AssemblyInfo.cs b/Aspects/Parsers/Properties/AssemblyInfo.cs
index 9db5a77..013ddeb 100644
--- a/Aspects/Parsers/Properties/AssemblyInfo.cs
+++ b/Aspects/Parsers/Properties/AssemblyInfo.cs
@@ -6,9 +6,9 @@
 [assembly: AssemblyTitle("vm.Aspects.Parser")]
 [assembly: AssemblyDescription("Text parsing readers, e.g. CSV/TSV reader.")]
 
-[assembly: AssemblyVersion("1.0.50")]
-[assembly: AssemblyFileVersion("1.0.50")]
-[assembly: AssemblyInformationalVersion("1.0.50")]
+[assembly: AssemblyVersion("1.0.51")]
+[assembly: AssemblyFileVersion("1.0.51")]
+[assembly: AssemblyInformationalVersion("1.0.51")]
 
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo(
     "vm.Aspects.Parsers.Tests, " +
diff --git a/Aspects/Properties/AssemblyInfo.cs b/Aspects/Properties/AssemblyInfo.cs
index 8a1fa91..651c220 100644
--- a/Aspects/Properties/AssemblyInfo.cs
+++ b/Aspects/Properties/AssemblyInfo.cs
@@ -2,9 +2,9 @@
 
 [assembly: AssemblyTitle("vm.Aspects")]
 [assembly: AssemblyDescription("A set of classes addressing various common cross-cutting concerns.")]
-[assembly: AssemblyVersion("1.0.50")]
-[assembly: AssemblyFileVersion("1.0.50")]
-[assembly: AssemblyInformationalVersion("1.0.50")]
+[assembly: AssemblyVersion("1.0.51")]
+[assembly: AssemblyFileVersion("1.0.51")]
+[assembly: AssemblyInformationalVersion("1.0.51")]
 
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo(
     "vm.Aspects.Test, " +
diff --git a/Aspects/Security/Cryptography/Ciphers/NuGet/PublishCiphers.cmd b/Aspects/Security/Cryptography/Ciphers/NuGet/PublishCiphers.cmd
index a81b136..4604823 100644
--- a/Aspects/Security/Cryptography/Ciphers/NuGet/PublishCiphers.cmd
+++ b/Aspects/Security/Cryptography/Ciphers/NuGet/PublishCiphers.cmd
@@ -18,7 +18,7 @@ if not exist c:\NuGet md c:\NuGet
 copy /y *.nupkg c:\NuGet
 @echo Press any key to push to NuGet.org... > con:
 @pause > nul:
-NuGet Push Ciphers.1.11.9.nupkg -source https://www.nuget.org/api/v2/
+NuGet Push Ciphers.1.11.9.nupkg -source https://www.nuget.org
 :exit
 popd
 pause
diff --git a/Aspects/Wcf/AsyncCallContext.cs b/Aspects/Wcf/AsyncCallContext.cs
index 016f086..13baf93 100644
--- a/Aspects/Wcf/AsyncCallContext.cs
+++ b/Aspects/Wcf/AsyncCallContext.cs
@@ -12,11 +12,16 @@ namespace vm.Aspects.Wcf
     /// Maintains a simple synchronized key-value collection to replace
     /// the one from the <see cref="CallContext"/> which is failing in asynchronous situations.
     /// </summary>
-    public class AsyncCallContext
+    public class AsyncCallContext : IDisposable, IIsDisposed
     {
         readonly ReaderWriterLockSlim _lock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
         IDictionary<string, object> _contextSlots = new Dictionary<string, object>();
 
+        /// <summary>
+        /// Gets the current asynchronous call context.
+        /// </summary>
+        public static AsyncCallContext Current => CallContext.LogicalGetData(nameof(AsyncCallContext)) as AsyncCallContext;
+
         /// <summary>
         /// Gets the entry at the data slot with name <paramref name="slotName"/>.
         /// </summary>
@@ -94,5 +99,68 @@ void ObjectInvariant()
         {
             Contract.Invariant(_contextSlots != null);
         }
+
+        #region IDisposable pattern implementation
+        /// <summary>
+        /// The flag will be set just before the object is disposed.
+        /// </summary>
+        /// <value>0 - if the object is not disposed yet, any other value - the object is already disposed.</value>
+        /// <remarks>
+        /// Do not test or manipulate this flag outside of the property <see cref="IsDisposed"/> or the method <see cref="Dispose()"/>.
+        /// The type of this field is Int32 so that it can be easily passed to the members of the class <see cref="Interlocked"/>.
+        /// </remarks>
+        int _disposed;
+
+        /// <summary>
+        /// Returns <see langword="true"/> if the object has already been disposed, otherwise <see langword="false"/>.
+        /// </summary>
+        public bool IsDisposed => Interlocked.CompareExchange(ref _disposed, 1, 1) == 1;
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        /// <remarks>Invokes the protected virtual <see cref="Dispose(bool)"/>.</remarks>
+        [SuppressMessage("Microsoft.Design", "CA1063:ImplementIDisposableCorrectly", Justification = "It is correct.")]
+        public void Dispose()
+        {
+            // if it is disposed or in a process of disposing - return.
+            if (Interlocked.Exchange(ref _disposed, 1) != 0)
+                return;
+
+            // these will be called only if the instance is not disposed and is not in a process of disposing.
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Allows the object to attempt to free resources and perform other cleanup operations before it is reclaimed by garbage collection. 
+        /// </summary>
+        /// <remarks>Invokes the protected virtual <see cref="Dispose(bool)"/> with parameter <see langword="false"/>.</remarks>
+        ~AsyncCallContext()
+        {
+            Dispose(false);
+        }
+
+        /// <summary>
+        /// Performs the actual job of disposing the object.
+        /// </summary>
+        /// <param name="disposing">
+        /// Passes the information whether this method is called by <see cref="Dispose()"/> (explicitly or
+        /// implicitly at the end of a <c>using</c> statement), or by the finalizer.
+        /// </param>
+        /// <remarks>
+        /// If the method is called with <paramref name="disposing"/>==<see langword="true"/>, i.e. from <see cref="Dispose()"/>, 
+        /// it will try to release all managed resources (usually aggregated objects which implement <see cref="IDisposable"/> as well) 
+        /// and then it will release all unmanaged resources if any. If the parameter is <see langword="false"/> then 
+        /// the method will only try to release the unmanaged resources.
+        /// </remarks>
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!disposing)
+                return;
+
+            _lock.Dispose();
+        }
+        #endregion
     }
 }
diff --git a/Aspects/Wcf/Behaviors/AsyncCallContextMessageInspector.cs b/Aspects/Wcf/Behaviors/AsyncCallContextMessageInspector.cs
index 1044f6a..60a713a 100644
--- a/Aspects/Wcf/Behaviors/AsyncCallContextMessageInspector.cs
+++ b/Aspects/Wcf/Behaviors/AsyncCallContextMessageInspector.cs
@@ -1,6 +1,4 @@
-using System.Diagnostics;
-using System.Globalization;
-using System.Runtime.Remoting.Messaging;
+using System.Runtime.Remoting.Messaging;
 using System.ServiceModel;
 using System.ServiceModel.Channels;
 using System.ServiceModel.Dispatcher;
@@ -29,9 +27,6 @@ public object AfterReceiveRequest(
 
             CallContext.LogicalSetData(CallContextSlotName, context);
 
-            Trace.WriteLine(
-                string.Format(CultureInfo.InvariantCulture, "### Installed async context: {0}", context.GetHashCode().ToString()));
-
             return null;
         }
 
@@ -44,12 +39,10 @@ public void BeforeSendReply(
             ref Message reply,
             object correlationState)
         {
-            if (!ClearCallContext())
-                Trace.WriteLine(
-                    string.Format(CultureInfo.InvariantCulture, "*** ASYNC CONTEXT WAS NOT FOUND!"));
+            ClearCallContext();
         }
 
-        bool ClearCallContext()
+        static bool ClearCallContext()
         {
             var context = CallContext.LogicalGetData(CallContextSlotName) as AsyncCallContext;
 
@@ -58,8 +51,6 @@ bool ClearCallContext()
 
             context.Clear();
             CallContext.FreeNamedDataSlot(CallContextSlotName);
-            Trace.WriteLine(
-                string.Format(CultureInfo.InvariantCulture, "### Cleared async context: {0}", context.GetHashCode().ToString()));
             return true;
         }
     }
diff --git a/Aspects/Wcf/PerAsyncCallContextLifetimeManager.cs b/Aspects/Wcf/PerAsyncCallContextLifetimeManager.cs
index a88b8e5..d4a4b0b 100644
--- a/Aspects/Wcf/PerAsyncCallContextLifetimeManager.cs
+++ b/Aspects/Wcf/PerAsyncCallContextLifetimeManager.cs
@@ -40,7 +40,7 @@ public override void RemoveValue()
             AsyncCallContext.FreeDataSlot(Key);
         }
 
-        AsyncCallContext AsyncCallContext
+        static AsyncCallContext AsyncCallContext
         {
             get
             {
diff --git a/Aspects/Wcf/Properties/AssemblyInfo.cs b/Aspects/Wcf/Properties/AssemblyInfo.cs
index 390e4e3..fa0a57b 100644
--- a/Aspects/Wcf/Properties/AssemblyInfo.cs
+++ b/Aspects/Wcf/Properties/AssemblyInfo.cs
@@ -3,9 +3,9 @@
 [assembly: AssemblyTitle("Wcf")]
 [assembly: AssemblyDescription("A set of classes and generics simplifying the initial configuration work of creating WCF services.")]
 
-[assembly: AssemblyVersion("1.0.50")]
-[assembly: AssemblyFileVersion("1.0.50")]
-[assembly: AssemblyInformationalVersion("1.0.50")]
+[assembly: AssemblyVersion("1.0.51")]
+[assembly: AssemblyFileVersion("1.0.51")]
+[assembly: AssemblyInformationalVersion("1.0.51")]
 
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo(
     "vm.Aspects.Wcf.Test, " +