class Program
    {
        static dynamic das;
        static void Main(string[] args)
        {
            var a = addSomething<int>(4, 7);
            var b = addSomething<string>("chuj", "sram");
        }

        static T addSomething<T>(T a, T b)
        {
            dynamic aa = a;
            dynamic bb = b;
            dynamic result;
            try
            {
                result = aa + bb;
            }
            catch (Exception)
            {
                return result=null;
            }
            return aa+bb;

        }
    }