Increment of number after grabbing it from DB

Question

The situation is I have connected to my Oracle database and grabbed an INT number i wanted and display into my form textbox.No prob thus far...But i want it to +1 or increment and at lost of how to do so.

localSQL = "SELECT MAX(ITEM_ID) FROM SYS_ITEM";  

                    OracleCommand cmdOracle = new OracleCommand(localSQL, localConnection);  

                    cmdOracle.CommandType = CommandType.Text;  

                    OracleDataReader drOracle = cmdOracle.ExecuteReader();  

                        if (drOracle.Read())  

                        {addlocaidBox.Text = drOracle.GetOracleValue(0).ToString();} 

The code look like this.I'd welcome any suggestions or advice.