DataGridViewCheckBoxColumn chkBoxColumn = new DataGridViewCheckBoxColumn();
              chkBoxColumn.Name = "CheckBoxes";
dataGridView1.Columns.Add(chkBoxColumn);

private void btnDelete_Click(object sender, EventArgs e)
        {
            if (GlobalDataStore.GetInstance().CheckedStatus == true)
            {
              string fName = GlobalDataStore.GetInstance().FirstName;
              string relation = GlobalDataStore.GetInstance().Relation;
              string idcardno = GlobalDataStore.GetInstance().Idcardno;
               string query = "DELETE  FROM DETAIL WHERE idcard_no = '" + idcardno.Trim() + "'" + " AND  FM_NAME = '" + fName.Trim() + "'" + " AND rln_fm_nm = '" + relation.Trim() + "'";
             DataSet ds = new DataSet();
             OracleDataAdapter da = new OracleDataAdapter(query, this.connection);
             da.Fill(ds);
             DataTable dt = ds.Tables[0];
             dt.Columns.Add("View");
             DataRow dr = dt.NewRow();
             dr["View"] = "View";
             dt.Rows.Add(dr);
             dt.AcceptChanges();
             DataView my_DataView = dt.DefaultView;
             dataGridView1.DataSource = my_DataView;
             connection.Close();
            }
          }