>That can be implemented in the Data class
>In the Clone() method - first do the MemberWiseClone(), then copy the dataset
>http://msdn.microsoft.com/en-us/library/system.icloneable(v=vs.110).aspx
>
>
>Notes to Implementers
>The ICloneable interface simply requires that your implementation of the Clone method return a copy of the current object instance. It does not specify whether the cloning operation performs a deep copy, a shallow copy, or something in between.
>
>
>

>	class Test_Clone
>	{
>		internal static void Go()
>		{
>
>			Data d = new Data();
>			// do some changes to d.oDataSet
>
>			Data cloned = d.Clone() as Data;
>		}
>	}
>
>	class Data : ICloneable
>	{
>		internal DataSet oDataSet = new DataSet();
>		internal int Count = 4;
>
>		public object Clone()
>		{
>			Data cloned = (Data) MemberwiseClone();
>			cloned.oDataSet = cloned.oDataSet.Copy();
>
>			return cloned;
>		}
>	}
>

That is a very interesting approach. Thanks