Cross-thread operation not valid: Control 'listBox1' accessed from a thread other than the thread it was created on.

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plz help me in this message
Cross-thread operation not valid: Control 'listBox1' accessed from a thread other than the thread it was created on.
this my code

C#

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

            for (int i = 0; ; i++)
            {
                listBox1.Items.Add(i);
            }
        }
        private void BtFill_Click(object sender, EventArgs e)
        {
            System.Threading.Thread thr = new System.Threading.Thread(new System.Threading.ThreadStart(FillLIstBox));
            thr.Start();      
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
    }

Posted 24-Sep-11 9:21am

Mohamed kamel

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Simon Bang Terkildsen · Accepted Answer · 2011-09-24T09:42:00

You must interact with a control on the UI thread.
You can use Control.InvokeRequired[^] to determine if you're on the UI tread or not. If you're not on the UI thread you have to use Control.Invoke[^] or Control.BeginInvoke[^]

In the case you posted using Invoke wouldn't make sense, but I guess this is not your real case, so you'll want to do something like the following

C#

int j = i;
listBox1.Invoke(() => listBox1.Items.Add(j));