//Function: register a new manager of the system
//Return: a manager newd if the record is creaded successfully
// null if returned if the manager with a same name exists in db
public Manager RegisterManager(string pName, string pPwd, string pMail)
{
Manager manager = null;
bool? isExist = false;
DataContextDataContext dc = new DataContextDataContext();
dc.is_registered(pName, ref isExist);
if (isExist == true)
{ } //manager = null
else // not exist, can insert
{
try
{
dc.insert_manager(pName, pPwd, pMail);
manager = new Manager(pName, pPwd, pMail);
}
catch (Exception ex)
{ } //custom = null;
}
return manager;
}