Generic class with optional parameter

public class Generic<T>

      where T : new()

    {

        private T objClass;

        public T ClassInstance

        {

            get

            {

                if (objClass == null)

                {

                    objClass = new T();

                }

 

                return objClass;

            }

        }

    }

 

    public class Generic<T, T1> : Generic<T>

        where T1 : new()

        where T : new()

    {

        private T1 objClass1;

        public T1 ClassInstance1

        {

            get

            {

                if (objClass1 == null)

                {

                    objClass1 = new T1();

                }

 

                return objClass1;

            }

        }

    }