>>>Hi Gregory and thanks, I should have been clearer, I don't want an instance of the class I need its type , what I need to do is get a List(T) from a Generic(T) class , the generic class expects a class of type IMyInterFace to create and populate a List(T) I show a code snippet below
>>>
>>>

>>>I create it like this at the moment
>>>
>>>if(some condition)
>>>    XLToList(MyClass) xlist = new XLToList(MyClass)();
>>>else
>>>    XLToList(MyOtherClass) xlist2 = new XLToList(MyOtherClass)();
>>>
>>>
>>>public class XlToList(T) where T : ITariffDataImport, new()
>>>    {
>>>        public delegate void Notify(object sender, CSVEventargs e);
>>>        public delegate void NotifyEveryRecord(int RecordNumber);
>>>        public event Notify OnFinishedProcessing;
>>>        public event Notify OnFoundBadTariff;
>>>        public event Notify OnFoundStartingRow;
>>>        public event NotifyEveryRecord OnProcessingRecords;
>>>
>>>
>>>        private Type thistype = typeof(T);
>>>
>>>        private List(T) data;
>>>
>>>        public List(T) Data
>>>        {
>>>            get
>>>            {
>>>                return data;
>>>            }
>>>            set
>>>            {
>>>                data = value;
>>>            }
>>>        }
>>>

>>>
>>>and the class uses T to create types and class instances etc... any clearer ? ( sorry I've used parentheses instead of angle brackets because of the UT limitations.)
>>>
>>>Thanks again Greg
>>
>>I've got this, Pete
>>
>>The Data member of XlToList is a list of the interface
>>
>>You have to cast - see constructor of XlToList
>>
>>

>>	static class Test_GenericInterface
>>	{
>>		internal static void Go()
>>		{
>>			List<ITest> xlist;
>>		
>>			if (true)
>>				 xlist = new XlToList<ClassA>().Data;
>>			else
>>				xlist = new XlToList<ClassB>().Data;
>>			
>>		}
>>		
>>	}
>>	public class XlToList<T> where T : ITest, new()
>>	{
>>		public delegate void NotifyEveryRecord(int RecordNumber);
>>		public event NotifyEveryRecord OnProcessingRecords;
>>
>>
>>		private Type thistype = typeof(T);
>>
>>		private List<ITest> data;
>>
>>		public List<ITest> Data
>>		{
>>			get
>>			{
>>				return data;
>>			}
>>			set
>>			{
>>				data = value;
>>			}
>>		}
>>		public XlToList()
>>		{
>>			data = new List<ITest>();
>>			data.Add( (ITest)new T());
>>		}
>>	}
>>	public interface ITest
>>	{
>>		int Get();
>>	}
>>	public class ClassA : ITest
>>	{
>>		
>>		public int Get()
>>		{
>>			return 1;
>>		}
>>
>>	}
>>	public class ClassB : ITest
>>	{
>>	
>>		public int Get()
>>		{
>>			return 3;
>>		}
>>	}
>>

But you're can't assign a List of ClassA to xlist.Data can you ?

No, you can't - but you knew didn't you