Преобразование строки в объект и та же строка для преобразования объекта

I am trying to convert object into string. After that i am doing some operations on those string and again i convert same string to object.But when i am trying to fetch those object's field value. i am getting object null

MyClass.Class1 ob = new MyClass.Class1();
            ob.Name = "Pragya";
            ob.Age = 24;

            string stringob = Convert.ToString(ob);
             //some operation I am doing here
            Assembly assembly = Assembly.GetExecutingAssembly();
            MyClass.Class1 ob1 = assembly.CreateInstance(stringob) as MyClass.Class1;
            textname.text=ob1.Name;//getting null