Dynamic Culture WPF

Hi, I have a question about handling dynamic culture changes in my WPF app. I'd like to change the culture while the app is running, so I call this method each time I change the app's culture. However, I have a problem when converting back a double input, because some threads were already open and didn't consider the new culture change. How should I handle this ? Should i do this in order to make sure the culture is consider Result = Convert.ToDouble(value, MyCurrentCulture);