private void GetDGVType(DataGridView dgv)
        {
            if (dgv.DataSource == null)
                MessageBox.Show("DataGridView.DataSource is null");
            else
            if (dgv.DataSource.GetType() == typeof(BindingSource))
            {
                var bsSource = ((BindingSource)dgv.DataSource).DataSource;
                if (bsSource != null)
                    TypeOfGdv(dgv, bsSource, true);
            }
            else
                TypeOfGdv(dgv, dgv.DataSource, false);
        }

        private void TypeOfGdv(DataGridView dgv, object dgvSource, bool isBindingSource)
        {
            string dgvSourceType = dgv.DataSource.GetType().Name;
            string dgvChildType = dgvSource.GetType().Name;
            string sMessage = "DataGridView.DataSource:";
            sMessage += "\n" + "->".PadLeft(12) + "\t" + dgvSourceType;
            if (isBindingSource)
            {
                sMessage += "\n" + "->".PadLeft(12) + "\t" + dgvChildType;
            }
            if (dgvSource.GetType() == typeof(DataSet))
            {
                sMessage += "\n" + "->".PadLeft(12) + "\t" + dgv.DataMember;
            }
            MessageBox.Show(sMessage);
        }