C# 7.0 features.

Algo/BasketMessageAdapter.cs

@@ -670,10 +670,7 @@ private void ProcessPortfolioMessage(string portfolioName, Message message)
 			{
 				var a = _hearbeatAdapters.TryGetValue(adapter);
 
-				if (a == null)
-					throw new InvalidOperationException(LocalizedStrings.Str1838Params.Put(adapter.GetType()));
-
-				adapter = a;
+				adapter = a ?? throw new InvalidOperationException(LocalizedStrings.Str1838Params.Put(adapter.GetType()));
 			}
 
 			adapter.SendInMessage(message);

Algo/BasketPortfolio.cs

@@ -55,10 +55,7 @@ private sealed class WeightedPosition : BasketPosition
 			{
 				public WeightedPosition(WeightedPortfolio portfolio, IEnumerable<Position> innerPositions)
 				{
-					if (innerPositions == null)
-						throw new ArgumentNullException(nameof(innerPositions));
-
-					_innerPositions = innerPositions;
+					_innerPositions = innerPositions ?? throw new ArgumentNullException(nameof(innerPositions));
 
 					decimal? beginValue = null;
 					decimal? currentValue = null;
@@ -99,10 +96,7 @@ public WeightedPosition(WeightedPortfolio portfolio, IEnumerable<Position> inner
 
 			public WeightsDictionary(WeightedPortfolio parent, IConnector connector)
 			{
-				if (parent == null)
-					throw new ArgumentNullException(nameof(parent));
-
-				_parent = parent;
+				_parent = parent ?? throw new ArgumentNullException(nameof(parent));
 				_connector = connector;
 			}
 

Algo/Candles/CandleManager.cs

@@ -45,10 +45,7 @@ private sealed class SourceInfo : Disposable
 
 				public SourceInfo(ICandleSource<Candle> source, CandleManager manager)
 				{
-					if (source == null)
-						throw new ArgumentNullException(nameof(source));
-
-					_source = source;
+					_source = source ?? throw new ArgumentNullException(nameof(source));
 					_manager = manager;
 
 					_source.Processing += OnProcessing;
@@ -81,10 +78,7 @@ protected override void DisposeManaged()
 
 			public CandleManagerSourceList(CandleManager manager)
 			{
-				if (manager == null)
-					throw new ArgumentNullException(nameof(manager));
-
-				_manager = manager;
+				_manager = manager ?? throw new ArgumentNullException(nameof(manager));
 			}
 
 			protected override void OnAdded(ICandleSource<Candle> item)
@@ -136,10 +130,7 @@ private sealed class ExternalCandleSource : Disposable, ICandleSource<Candle>
 
 			public ExternalCandleSource(IExternalCandleSource source)
 			{
-				if (source == null)
-					throw new ArgumentNullException(nameof(source));
-
-				_source = source;
+				_source = source ?? throw new ArgumentNullException(nameof(source));
 				_source.NewCandles += OnNewCandles;
 				_source.Stopped += OnStopped;
 			}
@@ -222,10 +213,7 @@ private sealed class ConnectorCandleSource : Disposable, ICandleSource<Candle>
 
 			public ConnectorCandleSource(Connector connector)
 			{
-				if (connector == null)
-					throw new ArgumentNullException(nameof(connector));
-
-				_connector = connector;
+				_connector = connector ?? throw new ArgumentNullException(nameof(connector));
 				_connector.CandleSeriesProcessing += OnConnectorProcessingCandle;
 				_connector.CandleSeriesStopped += OnConnectorCandleSeriesStopped;
 			}

Algo/Candles/CandleManagerContainer.cs

@@ -53,10 +53,7 @@ private sealed class SeriesInfo
 
 			public SeriesInfo(CandleManagerContainer container)
 			{
-				if (container == null)
-					throw new ArgumentNullException(nameof(container));
-
-				_container = container;
+				_container = container ?? throw new ArgumentNullException(nameof(container));
 			}
 
 			public int CandleCount => _allCandles.Count;

Algo/Candles/CandlesHolder.cs

@@ -26,10 +26,7 @@ private class CandlesSeriesHolder
 			/// <param name="series">Candles series.</param>
 			public CandlesSeriesHolder(CandleSeries series)
 			{
-				if (series == null)
-					throw new ArgumentNullException(nameof(series));
-
-				Series = series;
+				Series = series ?? throw new ArgumentNullException(nameof(series));
 			}
 
 			/// <summary>

Algo/Candles/IndexCandleBuilder.cs

@@ -146,14 +146,8 @@ private Candle CreateFilledCandle(Candle candle)
 
 		public IndexCandleBuilder(IndexSecurity security, Type candleType)
 		{
-			if (security == null)
-				throw new ArgumentNullException(nameof(security));
-
-			if (candleType == null)
-				throw new ArgumentNullException(nameof(candleType));
-
-			_security = security;
-			_candleType = candleType;
+			_security = security ?? throw new ArgumentNullException(nameof(security));
+			_candleType = candleType ?? throw new ArgumentNullException(nameof(candleType));
 			FillSecurityIndecies(_security);
 			_bufferSize = _securityIndecies.Values.Distinct().Count();
 		}

Algo/Candles/IndexSecurityCandleManagerSource.cs

@@ -44,27 +44,18 @@ private sealed class IndexSeriesInfo : Disposable
 
 			public IndexSeriesInfo(ICandleManager candleManager, Type candleType, IEnumerable<CandleSeries> innerSeries, DateTimeOffset? from, DateTimeOffset? to, IndexSecurity security, Action<Candle> processing, Action stopped)
 			{
-				if (candleManager == null)
-					throw new ArgumentNullException(nameof(candleManager));
-
 				if (innerSeries == null)
 					throw new ArgumentNullException(nameof(innerSeries));
 
 				if (security == null)
 					throw new ArgumentNullException(nameof(security));
 
-				if (processing == null)
-					throw new ArgumentNullException(nameof(processing));
-
-				if (stopped == null)
-					throw new ArgumentNullException(nameof(stopped));
-
-				_candleManager = candleManager;
+				_candleManager = candleManager ?? throw new ArgumentNullException(nameof(candleManager));
 				_innerSeries = innerSeries.ToHashSet();
 				_from = from;
 				_to = to;
-				_processing = processing;
-				_stopped = stopped;
+				_processing = processing ?? throw new ArgumentNullException(nameof(processing));
+				_stopped = stopped ?? throw new ArgumentNullException(nameof(stopped));
 
 				candleManager.Processing += OnInnerSourceProcessCandle;
 				candleManager.Stopped += OnInnerSourceStopped;
@@ -153,16 +144,10 @@ protected override void DisposeManaged()
 
 		public IndexSecurityCandleManagerSource(ICandleManager candleManager, ISecurityProvider securityProvider, DateTimeOffset? from, DateTimeOffset? to)
 		{
-			if (candleManager == null)
-				throw new ArgumentNullException(nameof(candleManager));
-
-			if (securityProvider == null)
-				throw new ArgumentNullException(nameof(securityProvider));
-
-			_securityProvider = securityProvider;
+			_securityProvider = securityProvider ?? throw new ArgumentNullException(nameof(securityProvider));
 			_from = from;
 			_to = to;
-			_candleManager = candleManager;
+			_candleManager = candleManager ?? throw new ArgumentNullException(nameof(candleManager));
 		}
 
 		public int SpeedPriority => 2;

Algo/Commissions/CommissionMessageAdapter.cs

@@ -41,13 +41,7 @@ public CommissionMessageAdapter(IMessageAdapter innerAdapter)
 		public ICommissionManager CommissionManager
 		{
 			get => _commissionManager;
-			set
-			{
-				if (value == null)
-					throw new ArgumentNullException(nameof(value));
-
-				_commissionManager = value;
-			}
+			set => _commissionManager = value ?? throw new ArgumentNullException(nameof(value));
 		}
 
 		/// <summary>

Algo/Connector_Subscription.cs

@@ -40,10 +40,7 @@ private sealed class SubscriptionManager
 
 			public SubscriptionManager(Connector connector)
 			{
-				if (connector == null)
-					throw new ArgumentNullException(nameof(connector));
-
-				_connector = connector;
+				_connector = connector ?? throw new ArgumentNullException(nameof(connector));
 			}
 
 			public void ClearCache()

Algo/Derivatives/BasketBlackScholes.cs

@@ -48,10 +48,7 @@ private sealed class InnerModelList : CachedSynchronizedList<BlackScholes>, IInn
 
 			public InnerModelList(BasketBlackScholes parent)
 			{
-				if (parent == null)
-					throw new ArgumentNullException(nameof(parent));
-
-				_parent = parent;
+				_parent = parent ?? throw new ArgumentNullException(nameof(parent));
 			}
 
 			BlackScholes IInnerModelList.this[Security option]
@@ -87,11 +84,8 @@ protected override bool OnInserting(int index, BlackScholes item)
 		public BasketBlackScholes(ISecurityProvider securityProvider, IMarketDataProvider dataProvider, IPositionProvider positionProvider)
 			: base(securityProvider, dataProvider)
 		{
-			if (positionProvider == null)
-				throw new ArgumentNullException(nameof(positionProvider));
-
 			_innerModels = new InnerModelList(this);
-			PositionProvider = positionProvider;
+			PositionProvider = positionProvider ?? throw new ArgumentNullException(nameof(positionProvider));
 		}
 
 		/// <summary>
@@ -103,12 +97,9 @@ public BasketBlackScholes(ISecurityProvider securityProvider, IMarketDataProvide
 		public BasketBlackScholes(Security underlyingAsset, IMarketDataProvider dataProvider, IPositionProvider positionProvider)
 			: base(underlyingAsset, dataProvider)
 		{
-			if (positionProvider == null)
-				throw new ArgumentNullException(nameof(positionProvider));
-
 			_innerModels = new InnerModelList(this);
 			UnderlyingAsset = underlyingAsset;
-			PositionProvider = positionProvider;
+			PositionProvider = positionProvider ?? throw new ArgumentNullException(nameof(positionProvider));
 		}
 
 		/// <summary>

Algo/Derivatives/BasketStrike.cs

@@ -37,18 +37,9 @@ public abstract class BasketStrike : BasketSecurity
 		/// <param name="dataProvider">The market data provider.</param>
 		protected BasketStrike(Security underlyingAsset, ISecurityProvider securityProvider, IMarketDataProvider dataProvider)
 		{
-			if (underlyingAsset == null)
-				throw new ArgumentNullException(nameof(underlyingAsset));
-
-			if (securityProvider == null)
-				throw new ArgumentNullException(nameof(securityProvider));
-
-			if (dataProvider == null)
-				throw new ArgumentNullException(nameof(dataProvider));
-
-			UnderlyingAsset = underlyingAsset;
-			SecurityProvider = securityProvider;
-			DataProvider = dataProvider;
+			UnderlyingAsset = underlyingAsset ?? throw new ArgumentNullException(nameof(underlyingAsset));
+			SecurityProvider = securityProvider ?? throw new ArgumentNullException(nameof(securityProvider));
+			DataProvider = dataProvider ?? throw new ArgumentNullException(nameof(dataProvider));
 		}
 
 		/// <summary>
@@ -110,10 +101,7 @@ public class OffsetBasketStrike : BasketStrike
 		public OffsetBasketStrike(Security underlyingSecurity, ISecurityProvider securityProvider, IMarketDataProvider dataProvider, Range<int> strikeOffset)
 			: base(underlyingSecurity, securityProvider, dataProvider)
 		{
-			if (strikeOffset == null)
-				throw new ArgumentNullException(nameof(strikeOffset));
-
-			_strikeOffset = strikeOffset;
+			_strikeOffset = strikeOffset ?? throw new ArgumentNullException(nameof(strikeOffset));
 		}
 
 		/// <summary>
@@ -180,10 +168,7 @@ public class VolatilityBasketStrike : BasketStrike
 		public VolatilityBasketStrike(Security underlyingAsset, ISecurityProvider securityProvider, IMarketDataProvider dataProvider, Range<decimal> volatilityRange)
 			: base(underlyingAsset, securityProvider, dataProvider)
 		{
-			if (volatilityRange == null)
-				throw new ArgumentNullException(nameof(volatilityRange));
-
-			_volatilityRange = volatilityRange;
+			_volatilityRange = volatilityRange ?? throw new ArgumentNullException(nameof(volatilityRange));
 		}
 
 		/// <summary>

Algo/Derivatives/BlackScholes.cs

@@ -35,14 +35,8 @@ public class BlackScholes : IBlackScholes
 		/// <param name="dataProvider">The market data provider.</param>
 		protected BlackScholes(ISecurityProvider securityProvider, IMarketDataProvider dataProvider)
 		{
-			if (securityProvider == null)
-				throw new ArgumentNullException(nameof(securityProvider));
-
-			if (dataProvider == null)
-				throw new ArgumentNullException(nameof(dataProvider));
-
-			SecurityProvider = securityProvider;
-			DataProvider = dataProvider;
+			SecurityProvider = securityProvider ?? throw new ArgumentNullException(nameof(securityProvider));
+			DataProvider = dataProvider ?? throw new ArgumentNullException(nameof(dataProvider));
 		}
 
 		/// <summary>
@@ -54,10 +48,7 @@ protected BlackScholes(ISecurityProvider securityProvider, IMarketDataProvider d
 		public BlackScholes(Security option, ISecurityProvider securityProvider, IMarketDataProvider dataProvider)
 			: this(securityProvider, dataProvider)
 		{
-			if (option == null)
-				throw new ArgumentNullException(nameof(option));
-
-			Option = option;
+			Option = option ?? throw new ArgumentNullException(nameof(option));
 		}
 
 		/// <summary>
@@ -67,14 +58,8 @@ public BlackScholes(Security option, ISecurityProvider securityProvider, IMarket
 		/// <param name="dataProvider">The market data provider.</param>
 		protected BlackScholes(Security underlyingAsset, IMarketDataProvider dataProvider)
 		{
-			if (underlyingAsset == null)
-				throw new ArgumentNullException(nameof(underlyingAsset));
-
-			if (dataProvider == null)
-				throw new ArgumentNullException(nameof(dataProvider));
-
-			_underlyingAsset = underlyingAsset;
-			DataProvider = dataProvider;
+			_underlyingAsset = underlyingAsset ?? throw new ArgumentNullException(nameof(underlyingAsset));
+			DataProvider = dataProvider ?? throw new ArgumentNullException(nameof(dataProvider));
 		}
 
 		/// <summary>
@@ -86,10 +71,7 @@ protected BlackScholes(Security underlyingAsset, IMarketDataProvider dataProvide
 		public BlackScholes(Security option, Security underlyingAsset, IMarketDataProvider dataProvider)
 			: this(underlyingAsset, dataProvider)
 		{
-			if (option == null)
-				throw new ArgumentNullException(nameof(option));
-
-			Option = option;
+			Option = option ?? throw new ArgumentNullException(nameof(option));
 		}
 
 		/// <summary>

Algo/Derivatives/Synthetic.cs

@@ -37,14 +37,8 @@ public class Synthetic
 		/// <param name="provider">The provider of information about instruments.</param>
 		public Synthetic(Security security, ISecurityProvider provider)
 		{
-			if (security == null)
-				throw new ArgumentNullException(nameof(security));
-
-			if (provider == null)
-				throw new ArgumentNullException(nameof(provider));
-
-			_security = security;
-			_provider = provider;
+			_security = security ?? throw new ArgumentNullException(nameof(security));
+			_provider = provider ?? throw new ArgumentNullException(nameof(provider));
 		}
 
 		private Security Option