private static void OnChanged(object source, FileSystemEventArgs e)
        {
            Fill(gvFiles);
        }

try
{
....
grid.DataSource = table;
}
catch (Exception ex)
{
     MessageBox.Show(ex.ToString(),"Error");
}

Fill()
{
     if (gvFiles.InvokeRequired)
     {
            this.Invoke(new MethodInvoker(Fill), null);
     }
     else
     {
            DataTable dt = new DataTable();
            .
            .
            .
            gvFiles.DataSource = dt;
     }
}

class ChangeEvent
{
     public DateTime eventTime {set;get;}
     public string filePath {set;get;}
     public ChangeEvent()
     {

     }

     public ChangeEvent(DateTime inTime, string inFilePath)
     {
           eventTime = inTime;
           filePath = inFilePath;
     }
}

List<ChangeEvent> eventLog = new List<ChangeEvent>();

Form1()
{
     BindingSource src_ = new BindingSource();
     src_.DataSource  = eventLog;
     dvFiles.DataSource = src_;
}

OnChanged(object source, FileSystemEventArgs e)
{
      lock (eventLog)
      {
           eventLog.Add(new ChangeEvent(....));
      }
      RefreshView();
}

void RefreshView()
{
     if (gvFiles.InvokeRequired)
     {
            this.Invoke(new MethodInvoker(Fill), null);
     }
     else
     {
            gvFiles.Refresh();
     }
}