dataTable中添加一列

 DataTable dt = (DataTable)this.dgv_outstockform.DataSource;

            // int dgvcount=dgv_outstockform.RowCount;

            MessageBox.Show("Rowscount" + dt.Rows.Count);

            //dataTable中添加一列

            dt.Rows.Add(dt.Rows.Count+1,"hhh");