cannot display thread result on a textbox

Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it was created on

i usually get this error,,i want to display the thread result to a textbox but i just can't..please help me,,thanks a lot

here's my code:

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading;
 
namespace MultiThread

{

    public partial class Form1 : Form

    {

        Thread thread;

        public Form1()

        {

            InitializeComponent();

        }
 
        // delegate is used to communicate with UI Thread from a non-UI thread

        //public delegate void UpdateTextCallback(string message);
 
        private void Form1_Load(object sender, EventArgs e)

        {
 
        }
 
        private void button1_Click(object sender, EventArgs e)

        {

            // Creates a new thread

            thread = new Thread(new ThreadStart(TestThread));

            thread.IsBackground = true;

            thread.Start();
 
        }
 
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)

        {

            thread.Abort();

        }
 
        private void TestThread()

        {

            for (int i = 0; i <= 1000; i++)

            {

                //Thread.Sleep(1000);

                textBox1.Text = textBox1.Text + "Thread";

                //textBox1.BeginInvoke(new UpdateTextCallback(UpdateText), new object[] { i.ToString() });

                Thread.Sleep(100);

            }

        }
 
        private void UpdateText(string message)

        {

            textBox1.Text = message;

        }

    }

}

Dec 7 '10 #1

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2085

Raj K

Use this code to update the text box

this.BeginInvoke(new Action(delegate() {textBox1.Text = textBox1.Text + "Thread";}));

Dec 8 '10 #2

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cannot display thread result on a textbox

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