Raising and subscribing to events

Question

I need help with the syntax to update the BackColor of a label on a form while a while loop is running on another form.

Form1 has a label.

Form2 has an if statement inside a while loop. When the if statement evaluates as true I need to change the BackColor of a label on Form1.

Thanks in advance for your help.

Class MyClass
{
      public delegate void ChangeColorDelegate();
      public event ChangeColorDelegate ChangeColor;
 
     While(true)
 
       if (something == true)
           (HAVING TROUBLE HERE)
           if (ChangeColor != null)
               ChangeColor();
 
}
 
Class MyOtherClass
{
      MyClass test = new MyClass();
      test.ChangeColor += (THIS IS WHERE I AM HAVING DIFFICULTY)