Is it OK to have virtual async method on base class?

Question

I am working with some code, where I have 2 classes with very similar logic and code. I have protected async void LoadDataAsync() method on both classes.
Curren

Answer 1

Agree with @Sam.
I throw exception just to ensure that actual logic is implemented. Better fits my requirement, that's all.

protected virtual Task LoadDataAsync()
{
    throw new NotImplementedException();
}