c# - How to determine that I have to reconnect basing on catched exception -

i'm using 3rd party library exchange data devices modbus protocol. code similar to:

if (modbusmaster == null)    modbusmaster = create(); //creating new connection try {     modbusmaster.read(); } catch(exception e) {     modbusmaster.dispose(); //dispose underlying connection     modbusmaster = null; } 

disposing , creating new neccesary if underlying connection tcp , connection closed. ioexception in 2 cases:

• there no response device, connection active , can reused
• connection forcibly closed , have reconnect.

how can recognize that? need avoid disposing connection when not needed

if aware of exceptions closes underlying connection, can tell program reconnect on such occasion

var lb_needtoreconnect = false; if(modbusmaster == null) modbusmaster = create(); //creating new connection try {           modbusmaster.read(); } catch(ioexception ioe) {   lb_needtoreconnect  = true; // know @ point connection closed      } catch(exception e) {   //log exception }  if(lb_needtoreconnect) {   //recreate modbus here }  if(modbusmaster == null)  {    //either work done or reconnect couldnt established }