When you click the form 2 button update form 1 label

Question

How can I pull the label from Form1 to form2 to label. Refresh?

Answer 1

When you instantiate form 2 when building it (Open the form), you need to pass a reference to the form 1 object (Previous Form), that is to have a form 1 property. So that in form 2 you call a public method that updates, or directly access the property of the object if it is public. Studying object orientation helps you understand better.

Example of what the class of the two forms would look like: Form 1

public partial class Form1 : Form
{
    public label labelNome;

    public void AbrirForm2()
    {
        Form2 segundoForm = new Form2();
        segundoForm.form1Reference = this;
    }
}

Form 2

public partial class Form2 : Form
{
    public Form1 form1Reference = null;

    public void EventoQueAlteraLabelDoForm1()
    {
        if(form1Reference != null)
            form1Reference.labelNome.text = "Hello World";
    }
}