[2.0] GUI editing problem via thread

[T-RonX]

Hello,

I would like to edit textMain from Form1 via a static class on an other thread. But I get the following error:

An object reference is required for the nonstatic field, method, or property 'WindowsApplication1.Form1.SetText(string)'

I simplified the example. Anybody who can help me?

    public partial class Form1 : Form
    {
        // Set text delegate
        public delegate void SetTextDelegate(string text);

        Thread trdTest;

        // Form1
        public Form1()
        {
            InitializeComponent();
            trdTest = new Thread(new ThreadStart(DoThread));
            trdTest.Start();
        }

        // Thread
        void DoThread()
        {
            StaticClass.EditGUI();
        }

        // Change textbox text
        public void SetText(string text) 
        {
            if (txtMain.InvokeRequired) 
            {
                object[] params_list = new object[] { text };
                txtMain.Invoke(new SetTextDelegate(SetText), params_list);
            }
            else 
            {
                txtMain.Text = text;
            }
        }

    }

    // Static class
    public static class StaticClass
    {
        public static void EditGUI()
        {
            Form1.SetText("test");
        }
    }