Question

I don’t want to create an object because it won’t affect my visible form. How can I call a method so it does its thing in the visible side of things.

public class foo
{
   public void SetString(string foo)
   {
       label1.Text = foo;
   }
}

Inside another class:

foo X = new foo();
X.SetString("testlololol");

This will set the label, but VIRTUALLY, I won’t be able to see it on my form.

How can I do the same thing, but on my VISIBLE side of things?

Answer 1

When you create your visible form store a references to it in some static property. Then other classes can use that property to run public methods of that class.

// the original form
class MyForm()
{
     // form public method
     public void MyMethod() { ... }
}

// class storing the reference to a form
class MyOtherClass
{     
    public static Form MyForm;

    public void ShowForm()
    {
        MyForm = new MyForm();
        MyForm.Show();
    }
}

// invoke form public method in this class
class YetAnotherClass
{
    public void SomeMethod ()
    {
        MyOtherClass.MyForm.MyMethod();
    }
}