How to send PIN messages in blackberry programatically?

public final class pinMessageScreen extends MainScreen implements FieldChangeListener
{
char []check = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
ButtonField Send;
String address;
EditField pinaddress;
boolean pass;
public pinMessageScreen()
{
setTitle("Working of PIN Messageds");
pinaddress = new EditField("Enter PIN Address : ", "", 8, 0);
add(pinaddress);
Send = new ButtonField("SEND", Field.FIELD_HCENTER);
add(Send);
Send.setChangeListener(this);
}
public void fieldChanged(Field field, int context)
{

if(field == Send)
{
if(pinaddress.getText().equalsIgnoreCase(""))
{
Dialog.inform("Enter Pin");
}
else if(pinaddress.getText().length()<8)
{
Dialog.inform("PIN Address should not be less than 8 chars");
pinaddress.setText("");
}
else
{
Store store = Session.getDefaultInstance().getStore();
Folder[] folder = store.list(Folder.SENT);
Folder sent = folder[0];
Message msg = new Message(sent);
PINAddress receipent[] = new PINAddress[1];
address = pinaddress.getText();
for (int i = 0; i < address.length(); i++)
{
pass = false;
for (int j = 0; j < check.length;j++)
{
if(address.charAt(i) == check[j])
{
System.out.println("<<<<<<<<<<address>>>>>>>>>" + address.charAt(i));
System.out.println("<<<<<<<<<<check>>>>>>>>" + check[j]);
pass = true;
break;
}
}
}
if(pass == true)
{
try
{
address = pinaddress.getText();
receipent[0] = new PINAddress(address, null);
msg.addRecipients(Message.RecipientType.TO, receipent);
msg.setSubject("Test Mail");
msg.setContent("This mail is to remind you that programmatically we can send the mail");
msg.setPriority(Priority.HIGH);
Transport.send(msg);
Dialog.inform("Email send Successfully!"+ receipent);
}
catch (Exception e)
{
e.printStackTrace();
}
}
else
{
Dialog.inform("Plz enter valid PIN Address");
pinaddress.setText("");
}
}
}
}
}