public string Save(Student student)
{
if (aStudentGateway.IsCourseExists(student))
{
return("This course already enrolled");
}
else
{
int isRowAffected = aStudentGateway.Save(student);
if (isRowAffected > 0)
{
return("Course enrolled successfull");
}
else
{
return("course enrolled failed");
}
}
}