请教如何移除某一列
请教高手，我不想备注一列在一下条件判断，请问如何做

   #region 判断是否存在空值

                DataTable dh = new DataTable();

                dh = dt;

               

              // dh.Columns.Remove(dh.Columns["备注"]);

                foreach (DataRow row in dh.Rows)

                {

                   

                    for (int i = 0; i < dh.Columns.Count; i++)

                    {

                        if (string.IsNullOrEmpty(row[i].ToString()))

                        {

                            row[i] = DBNull.Value;

                            MessageBox.Show("第" + i + "行存在空值，无法导入", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

                            return;

                        }

                    }

                }

------解决方案--------------------
dh.Columns.Remove("列名");

dh.Columns.RemoveAt(列下标);