because it is being used by another process ?

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C#

Hi guys,

Im making an application sending sms via 3g modem using the gsmcomm library.

After i connect to the port via clicking Connect button , the code below is executed.Then when I close the form and when i try to connect again to the same port..It says "The process cant access the file..because it is being used by another process " ..and it works behind Task manager..if i say "drop the task"..there is no prob as well

But if i close the form by clicking disconnect button..there is no problem after i reopen form and reconnect..

What can i do it ?

For closing event , i wrote port.Disconnect(); but doesnt execute..

int port = int.Parse(drpPort.Text);
int baud=int.Parse(drpBaudRate.Text);
int timeout = int.Parse(drpTimeOut.Text);

 comm = new GsmCommMain(port, baud,timeout);
 comm.Open();
 if (comm.IsOpen())
 {
     btnBaglan.Enabled = false;
     btniptal.Enabled = true;
     MessageBox.Show("Porta başarılı bir şekilde bağlandınız!!", "Dikkat!", MessageBoxButtons.OK, MessageBoxIcon.Information);
     lblBeklemede.Text = "Porta Bağlandı";
     bilgiler();

 }
 else
 {
     comm.Open();
 }