public class Tarufs
    {
        DataClasses1DataContext ds;
        public Tarufs()
        {           
                ds = new DataClasses1DataContext();            
        }
        public ObservableCollection<taruf> GetTaruf()
        {
            IEnumerable<taruf> myssQuery = from p in ds.taruf
                                           select p;
            ObservableCollection<taruf> source = new ObservableCollection<taruf>();
            foreach (taruf mmodel in myssQuery)
                source.Add(mmodel);
            return source;
        }
        public void SaveTaruf()
        {          
            ds.SubmitChanges();                      
        }
    }

DataClasses1DataContext ds;
 private void b_TarufuOpen_Click(object sender, EventArgs e)
        {
            ds = new DataClasses1DataContext();
            IEnumerable<taruf> myssQuery = from p in ds.taruf
                                           select p;
            ObservableCollection<taruf> source = new ObservableCollection<taruf>();
            foreach (taruf mmodel in myssQuery)
                source.Add(mmodel);
            dataGridViewTarufu.DataSource = source;          

        }

private void b_SaveTarufu_Click(object sender, EventArgs e)
        {            
            ds.SubmitChanges(); 
        }