public string Save(Student student)
{
int? departmentId = student.DepartmentId;
Department department = studentGateway.GetDepartmentInfoByDepartmentId(departmentId);
string departmentCode = department.Code;
string year = student.Date.Substring(6, 4);
string key = departmentCode + "-" + year + "-";
int totalStudent = studentGateway.CountTotalStudent(key);
string registrationNumber;
if (totalStudent >= 0 && totalStudent <= 9)
{
registrationNumber = departmentCode + "-" + year + "-00" + (totalStudent + 1);
}
else if (totalStudent <= 99 && totalStudent > 9)
{
registrationNumber = departmentCode + "-" + year + "-0" + (totalStudent + 1);
}
else
{
registrationNumber = departmentCode + "-" + year + "-" + (totalStudent + 1);
}
student.RegistrationNumber = registrationNumber;
int rowAffected = studentGateway.Save(student);
if (rowAffected > 0)
{
return("Student registered successfully");
}
return("Failed to register student!");
}