Thread: Cannot access a non-static member

hello,
I'm trying to change a value of the textbox within a class, but I get an error:

Cannot access a non-static member of outer type 'WindowsFormsApplication1.Form1' via nested type 'WindowsFormsApplication1.Form1.http'

How do I access the textbox? Thanks!

Code:

namespace WindowsFormsApplication1
{

  public partial class Form1 : Form
    {

        public class http
        {
            void update_text(string data)
            {
               textBox1.Text = data;
            }
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}