i have two classes: `Class1` and `Class2`

```
class Class1
{
    public void method();
}

class Class2
{
    public void method();
}

```

in another place I have the class type and I want to create an instance from it.
type is `typeof(Class1`) or `typeof(Class2)`

```
public void CreateInstance(Type type)
{
    var instance = Activator.GetInstance(type);
    instance.method(); //compile error: object doesn't contain method
}

```

a solution is I define an interface that my classes implement that interface.

```
interface IInterface
{
    void method();
}

public void CreateInstance(Type type)
{
    var instance = Activator.GetInstance(type);
    ((IInterface)instance).method();
}

```

because I can't access to class definition I can't do this. How can I do this?