Designing a function that waits for a button press.

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C#

Let's say I wanted to make an options form. The object that contains it is called Options, for example. I want to be able to call a function in Options that would make it run, wait for the user to input values in the form and press okay, and then return a value. How could I design a function inside the Options class that waits for a button press before returning a value? Like this:

public partial class Options : Form
{
    public SomeClass Run(SomeClass defualts)
    {
         //Do some set up stuff like setting up the options with 
         //their default values or whatever I'd like
         
         //Wait for the user to press okay  <-- Need help here
         //then do this:
         return SomeVariable;
    }
}

Thanks :-D