Can't click button on form during function call in C#

[jakeesgirl]

I am developing a program in C# Visual Studio and I have a form that is created when a button is clicked on another form. This new form comes up and immediately, a function is called and executed from the load function. After the function is done, the form is closed. I have a 'Cancel' button on the form so the user can have the option cancel the function, but the button can't be clicked while the form is visible. How can I fix this problem?

[Plater]

Are you using .ShowDialog() to show that form? If so, it's a blocking call and you willwant to use .Show() instead.

Another possibility is that it's running in the same thread and it is too busy performing your function to handle your request.

[jakeesgirl]

I am using .Show(). Is there any way to avoid the other?

[Plater]

Run it in a new thread?
It would be trickier to tell it to "cancel" then (outside of killing the thread)