Passing variables between forms using a button [duplicate]

Answer 1

Alternatively to passing the value by Form2 constructor, you can create a property that sets the label value, e.g.

Form2

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
    }

    public int XValue{
        set{
            label1.Text = value.ToString(); 
        }
    }
}

Form1

    public partial class Form1 : Form
{
    private int x = 10;

    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Form2 form2 = new Form2();
        form2.XValue = x;
        form2.Show();
    }
}