Here's my problem : I have a DataGridView bound to a BindingList of custom objects. A background thread is constantly updating a value of these objects. The udpates are showing correctly, and everything is fine except for one thing - If you try to edit a different field while the background-updated field is being updated, it loses the entered value. Here is a code sample that demonstrates this behavior: (for new form, drop a new DataGridView on:)

    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 WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        private BindingList<foo> flist;
        private Thread thrd;
        private BindingSource b;
        public Form1()
        {
            InitializeComponent();
            flist = new  BindingList<foo>
                    {
                        new foo(){a =1,b = 1, c=1}, 
                        new foo(){a =1,b = 1, c=1}, 
                        new foo(){a =1,b = 1, c=1}, 
                        new foo(){a =1,b = 1, c=1}
                    };
            b = new BindingSource();
            b.DataSource = flist;
            dataGridView1.DataSource = b;
            thrd = new Thread(new ThreadStart(updPRoc));
            thrd.Start();

        }

        private void upd()
        {
            flist.ToList().ForEach(f=>f.c++);
        }  

        private void updPRoc()
        {
            while (true)
            {
                this.BeginInvoke(new MethodInvoker(upd));
                Thread.Sleep(1000);
            }
        }
    }


    public class foo:INotifyPropertyChanged
    {
       private int _c;
       public  int a { get; set; }
       public int b { get; set; }
       public int c 
       { 
           get {return _c;}
           set
           {
               _c = value;
               if (PropertyChanged!= null)
                   PropertyChanged(this,new PropertyChangedEventArgs("c"));
           }
       }

       #region INotifyPropertyChanged Members

       public event PropertyChangedEventHandler PropertyChanged;

       #endregion
    }
}

So, you edit column a or b, you will see that the column c update causes you to lose your entry.

Any thoughts appreciated.