HOW TO ADD DELETE QUERY IN SQLDATAREADER LOOP IN ASP.NET C#

con.Open();
                  SqlCommand cmddr=new SqlCommand("SELECT * FROM Credit WHERE ID='"+Session["DID"]+"'",con);
                  SqlDataReader drcredit = cmddr.ExecuteReader();
                  if (drcredit.HasRows)
                  {
                     
                      while (drcredit.Read())
                      {
                          string ref1 = drcredit["ref"].ToString();
                          string refid = drcredit["refid"].ToString();
                          string crdol = drcredit["valuesdol"].ToString();
                          string crrs = drcredit["valuesrs"].ToString();

                          
                          con.Open();
                          SqlCommand cmdmp = new SqlCommand("SELECT * FROM Party_Master WHERE refid='" + refid + "'", con);
                          SqlDataReader drmp = cmdmp.ExecuteReader();
                          if (drmp.HasRows)
                          {
                              drmp.Read();
                              string crdoller = drmp["crdol"].ToString();
                              string crrupess = drmp["crrs"].ToString();
                              Session["crdoller"] = crdoller;
                              Session["crrupess"] = crrupess;
                              drmp.Close();
                          }
                          con.Close();
                         
                      }
                  }