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    <p>You can create a SerializationSurrogate and a SurrogateSelector for the StopWatch.</p> <p>Be mindful that the StopWatch class may have machine specific state, i.e. the tick frequency and the like. So when you serialize, check the Serialization context that the serialization is not intended for cross machine usage (if you intend to copy all the values), or create a completly new instance with only the timing data.</p> <pre><code>namespace MaLio.StopWatch { class Program { static void Main(string[] args) { Container container = new Container(); Container copy = null; System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); // may be a formatter created elsewhere if (formatter.SurrogateSelector == null) { formatter.SurrogateSelector = new StopWatchSelector(); } else { formatter.SurrogateSelector.ChainSelector(new StopWatchSelector()); } using (System.IO.MemoryStream stream = new System.IO.MemoryStream()) { formatter.Serialize(stream, container); stream.Flush(); stream.Position = 0; copy = formatter.Deserialize(stream) as Container; } System.Diagnostics.Debug.WriteLine( "Reference Equals: " + (object.ReferenceEquals(container, copy)).ToString()); System.Console.ReadKey(); } } public class StopWatchSelector : System.Runtime.Serialization.SurrogateSelector { private StopWatchSurrogate _Surrogate; public StopWatchSelector() { _Surrogate = new StopWatchSurrogate(); } public override System.Runtime.Serialization.ISerializationSurrogate GetSurrogate( System.Type type, System.Runtime.Serialization.StreamingContext context, out System.Runtime.Serialization.ISurrogateSelector selector) { System.Runtime.Serialization.ISerializationSurrogate surrogate; surrogate = base.GetSurrogate(type, context, out selector); if (surrogate == null) { if (type == typeof(System.Diagnostics.Stopwatch)) { surrogate = _Surrogate; } } return surrogate; } } public class StopWatchSurrogate : System.Runtime.Serialization.ISerializationSurrogate { private const string NULL_INDICATOR_STRING = @"__StopWatchNull"; // the invalid contexts as an example private const System.Runtime.Serialization.StreamingContextStates INVALID_CONTEXTS = System.Runtime.Serialization.StreamingContextStates.CrossMachine | System.Runtime.Serialization.StreamingContextStates.Remoting; public void GetObjectData( object obj, System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) { System.Diagnostics.Stopwatch stopWatch = obj as System.Diagnostics.Stopwatch; if (stopWatch == null) { info.AddValue(NULL_INDICATOR_STRING, true); } else { info.AddValue(NULL_INDICATOR_STRING, false); // add other values looked up via reflection } } public object SetObjectData ( object obj, System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context, System.Runtime.Serialization.ISurrogateSelector selector) { System.Diagnostics.Stopwatch stopWatch = null; bool isNull = info.GetBoolean(NULL_INDICATOR_STRING); if (!isNull) { stopWatch = obj as System.Diagnostics.Stopwatch; // read other values and set via reflection } return stopWatch; } private void CheckContext(System.Runtime.Serialization.StreamingContext context) { if ((context.State &amp; INVALID_CONTEXTS) != 0) { throw new System.NotSupportedException(); } } } [System.Serializable] public class Container { private System.Diagnostics.Stopwatch _Watch = new System.Diagnostics.Stopwatch(); } } </code></pre>
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    1. POHow to serialize System.Diagnostics.Stopwatch
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    1. COThanks to all for your help. I went with the MaLio's solution as the additional data I will serialize and persist will be deserialized and processed on the same machine. The classes that I am writing contain statistical data created by an application driver I am writing.
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