diff --git a/DynamORM.Tests/Helpers/PoolingTests.cs b/DynamORM.Tests/Helpers/PoolingTests.cs
index aa5a72d..1ce1ba2 100644
--- a/DynamORM.Tests/Helpers/PoolingTests.cs
+++ b/DynamORM.Tests/Helpers/PoolingTests.cs
@@ -26,7 +26,6 @@
  * THE POSSIBILITY OF SUCH DAMAGE.
 */
 
-using System;
 using NUnit.Framework;
 
 namespace DynamORM.Tests.Helpers
@@ -63,7 +62,7 @@ namespace DynamORM.Tests.Helpers
             Database.Dispose();
             Database = null;
 
-            Assert.Throws<ObjectDisposedException>(() => cmd.ExecuteScalar());
+            Assert.Throws<DynamicQueryException>(() => cmd.ExecuteScalar());
         }
 
         /// <summary>Test single mode transaction disposing.</summary>
diff --git a/DynamORM.Tests/Properties/AssemblyInfo.cs b/DynamORM.Tests/Properties/AssemblyInfo.cs
index c6b3373..d285638 100644
--- a/DynamORM.Tests/Properties/AssemblyInfo.cs
+++ b/DynamORM.Tests/Properties/AssemblyInfo.cs
@@ -61,5 +61,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.1")]
-[assembly: AssemblyFileVersion("1.0.0.1")]
\ No newline at end of file
+[assembly: AssemblyVersion("1.1.0.1")]
+[assembly: AssemblyFileVersion("1.1.0.1")]
\ No newline at end of file
diff --git a/DynamORM/DynamicCommand.cs b/DynamORM/DynamicCommand.cs
index 3b2da24..22f0198 100644
--- a/DynamORM/DynamicCommand.cs
+++ b/DynamORM/DynamicCommand.cs
@@ -57,7 +57,7 @@ namespace DynamORM
                 else
                 {
                     _command = _con.Connection.CreateCommand();
-                    _db.CommandsPool[_con.Connection].Add(_command);
+                    _db.CommandsPool[_con.Connection].Add(this);
                 }
             }
         }
@@ -134,11 +134,13 @@ namespace DynamORM
                     ////_poolStamp = 0;
                     _command.Connection = _con.Connection;
                 }
-                else
+                else if (value == null)
                 {
                     _command.Transaction = null;
                     _command.Connection = null;
                 }
+                else
+                    throw new InvalidOperationException("Can't assign direct IDbConnection implementation. This property accepts only DynamORM implementation of IDbConnection.");
             }
         }
 
@@ -238,7 +240,7 @@ namespace DynamORM
         /// <summary>Gets or sets the transaction within which the Command
         /// object of a data provider executes.</summary>
         /// <remarks>It's does nothing, transaction is peeked from transaction
-        /// pool of a connection.</remarks>
+        /// pool of a connection. This is only a dummy.</remarks>
         public IDbTransaction Transaction { get { return null; } set { } }
 
         /// <summary>Gets or sets how command results are applied to the <see cref="T:System.Data.DataRow"/>
@@ -264,13 +266,13 @@ namespace DynamORM
                 {
                     var pool = _db.CommandsPool.TryGetValue(_con.Connection);
 
-                    if (pool != null && pool.Contains(_command))
-                        pool.Remove(_command);
+                    if (pool != null && pool.Contains(this))
+                        pool.Remove(this);
                 }
 
-                _command.Dispose();
-
                 IsDisposed = true;
+
+                _command.Dispose();
             }
         }
 
diff --git a/DynamORM/DynamicDatabase.cs b/DynamORM/DynamicDatabase.cs
index c647451..56ad524 100644
--- a/DynamORM/DynamicDatabase.cs
+++ b/DynamORM/DynamicDatabase.cs
@@ -87,6 +87,7 @@ namespace DynamORM
         internal Dictionary<IDbConnection, Stack<IDbTransaction>> TransactionPool { get; private set; }
 
         /// <summary>Gets pool of connections and commands.</summary>
+        /// <remarks>Pool should contain dynamic commands instead of native ones.</remarks>
         internal Dictionary<IDbConnection, List<IDbCommand>> CommandsPool { get; private set; }
 
         /// <summary>Gets schema columns cache.</summary>
diff --git a/DynamORM/DynamicTransaction.cs b/DynamORM/DynamicTransaction.cs
index 3bc7efb..75b947f 100644
--- a/DynamORM/DynamicTransaction.cs
+++ b/DynamORM/DynamicTransaction.cs
@@ -49,7 +49,6 @@ namespace DynamORM
         /// <param name="disposed">This action is invoked when transaction is disposed.</param>
         internal DynamicTransaction(DynamicDatabase db, DynamicConnection con, bool singleTransaction, IsolationLevel? il, Action disposed)
         {
-            IsDisposed = false;
             _db = db;
             _con = con;
             _singleTransaction = singleTransaction;
@@ -63,7 +62,8 @@ namespace DynamORM
                     _operational = false;
                 else
                 {
-                    _db.TransactionPool[_con.Connection].Push(_con.Connection.BeginTransaction());
+                    _db.TransactionPool[_con.Connection]
+                        .Push(il.HasValue ? _con.Connection.BeginTransaction(il.Value) : _con.Connection.BeginTransaction());
                     _db.PoolStamp = DateTime.Now.Ticks;
                     _operational = true;
                 }
@@ -137,12 +137,10 @@ namespace DynamORM
 
             if (_disposed != null)
                 _disposed();
-
-            IsDisposed = true;
         }
 
         /// <summary>Gets a value indicating whether this instance is disposed.</summary>
-        public bool IsDisposed { get; private set; }
+        public bool IsDisposed { get { return !_operational; } }
 
         #endregion IExtendedDisposable Members
     }
diff --git a/DynamORM/Properties/AssemblyInfo.cs b/DynamORM/Properties/AssemblyInfo.cs
index 9458c1c..34b892d 100644
--- a/DynamORM/Properties/AssemblyInfo.cs
+++ b/DynamORM/Properties/AssemblyInfo.cs
@@ -62,6 +62,6 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.1")]
-[assembly: AssemblyFileVersion("1.0.0.1")]
+[assembly: AssemblyVersion("1.1.0.1")]
+[assembly: AssemblyFileVersion("1.1.0.1")]
 [assembly: InternalsVisibleTo("DynamORM.Tests")]
\ No newline at end of file