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Control Characters in vb.net

Hi - With vb.Net 2005 and using serial port control to communicate with modem using AT commands.   I am using SerialPort1.write("AT+xx") etc.  For one command in hyperterminal I would send Control Z, can someone please advise how this is done in .net, perhaps with a code sample?  Many Thanks
Visual Basic.NET

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8/22/2022 - Mon