using (OracleDataAdapter da = new OracleDataAdapter())
            {
                try
                {
                    string strSQL="Select * from t1"; 
                    OpenConn();//打开连接
                    OracleCommand cmd;
                    OracleParameter parm;
                    DataTable dt = new DataTable();
                    cmd = new OracleCommand(strSQL, conn);
                    da.SelectCommand = cmd;
                    da.Fill(dt);                    
                    string delsql = "DELETE FROM t1 WHERE ID=:pID";
                    cmd = new OracleCommand(delsql, conn);
                    parm = cmd.Parameters.Add(":pID", OracleType.VarChar, 50, "ID");
                    parm.SourceVersion = DataRowVersion.Original;
                    da.DeleteCommand = cmd;
                   // int a = da.Update(dt);
                }
                catch (Exception ex)
                {
                    //省略
                }
            }

adapter.Fill(dt);
                        dt.Rows[1].Delete();//删除DataTable中的某一行,根据需要自行删除
                        adapter.DeleteCommand = com;
                        adapter.Update(dt);