How to make Form1 label.text change when checkbox on form2 is checked?

Question

I\'m very new to c# and am trying my first experiments with 2 different forms.

I\'d like to make it so you have a label1 and a button1 on Form1, and a checkbox1 on F

Answer 1

Form1:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        var form = new Form2();
        form.Changed += (o, args) => label1.Text = "some";

        form.ShowDialog();
    }
}

Form2:

public partial class Form2 : Form
{
    public delegate void ChangedEventHandler(object sender, EventArgs e);

    public event ChangedEventHandler Changed;

    public Form2()
    {
        InitializeComponent();
    }

    private void checkBox1_CheckedChanged(object sender, EventArgs e)
    {
        if (Changed != null)
        {
            Changed(this, e);
        }
    }
}

Use CheckedChanged event of CheckBox.

Also, you can review good tutorial how to use Events in C#.