public static object TypeCast(object obj, Type t)
        {
            try
            {
                var param = Expression.Parameter(obj.GetType());
                return Expression.Lambda(Expression.Convert(param, t), param)
                    .Compile().DynamicInvoke(obj);
            }
            catch (TargetInvocationException ex)
            {
                throw ex.InnerException;
            }
        }