How do I solve access is denied in port

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SerialPort port = new SerialPort("COM36");
port.Open();
string t = port.ReadExisting();
Thread.Sleep(100);

string cmd = "ATD";
Thread.Sleep(100);
string phoneNumber = "";
Thread.Sleep(100);
port.WriteLine(cmd + phoneNumber + ";\r");

port.Close();

The error is access denied on COM36, I am not sure why

Posted 26-Jul-14 7:45am

polkj

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Dave Kreskowiak · Answer 1 · 2014-07-26T09:24:00

Solution 1

The port either doesn't exist or is being held open by some other process.

Posted 26-Jul-14 9:24am

Dave Kreskowiak

Comments

polkj 27-Jul-14 0:49am

the port is from my sansung mobile phone, I plug in my usb

Dave Kreskowiak 27-Jul-14 10:25am

No. I meant "COM36" doesn't exist. It may come up as a different post ID. Look in Device Manager under Ports to see what it is.