ASP.NET Index (Controller) method that only runs when I want

Question

good night. First I apologize for the ignorance, I am beginner as a developer.

From what I understand of ASP.NET, it will automatically run all void methods of my index when this index is called. For example:

    public class HomeController : Controller
{
    public ViewResult Index()
    {
        carregarlista1();
        carregarlista2();
        carregarlista3();
    }
    void carregarlista1()
    {
        exemplo de código
    }
    void carregarlista2()
    {
        exemplo de código
    }
    void carregarlista3()
    {
        exemplo de código
    }
}

When opening this Index, it will run all 3 void methods.

I would like to know if it is possible for me to create a code like the one above, but it will only run load1(); and load2();. And only run the method load3() when I click on a button in the View. It is possible to do this?

Thank you!