How to detect Control characters inside before I set HostName on my computer (C#)

[tvnaidu]

I am looking for some help on how to detect "Control Characters" once I receive HostName inside program, I am getting string, I am using SetComputerNameEx to set HostName, buit some times if any Control Characters present, I need to send error back. Here "str" carried string (HostName), sometimes it might contain Control characters (/\\|<>+=;,?), I need to detect and send error, how can I detect.

 
MessageBox.Box(" Received Host Name " + str);
 
SetComputerNameEx(GCInfo.COMPUTER_NAME_FORMAT.ComputerNamePhysicalNetBIOS, str));
 
SetComputerNameEx(GCInfo.COMPUTER_NAME_FORMAT.ComputerNamePhysicalDnsHostname, str))
 
 
 

[Rabbit]

You can use a regular expression to see if it matches any control characters and if it does, show an error message.

[tvnaidu]

Thanks for the hint, I got it.