Question

How do I change a property in a windows form from another class’ method?

Lets say I have Form1 with a label that says “Hello”, if I want to change that message to something else using a method from another class, how can i refere to that label?

Answer 1

Easiest way – change your label visibility to public and pass Form1 instance to that method. Correct one – declare public property Message on your Form1 class like this:

public string Message
{
   get { return label.Text; }
   set { label.Text = value; }
}

And also pass instance of form to your method:

void MyMethod(Form1 form1)
{
    form1.Message = "Hello world";
}