public string AddNewListStudents(List <DataAPI> dataAPIs)
{
var ErrorStrng = "";
foreach (var item in dataAPIs)
{
if (string.IsNullOrEmpty(item.Name) || string.IsNullOrEmpty(item.Surname) || string.IsNullOrEmpty(item.PassportNomber))
{
ErrorStrng += "All Informations Of Student Not Allow To be Empty in Item No :" + item.IdItem + " __ ";
}
else
{
if (_dalschool.IsExist(item.IdSchool))
{
if (!_dal.IsExist(item.Name, item.Surname)) // Not Allow to be more than one Student in same name in DB
{
var School = _dalschool.GetSchool(item.IdSchool);
_dal.AddNewStudent(Student.CreatStudent(item.Name, item.Surname, item.PassportNomber, School));
}
else
{
ErrorStrng += "This Student Is Exist Before in Item No :" + item.IdItem + " __ ";
}
}
else
{
ErrorStrng += "This School Is Not Exist in Item No :" + item.IdItem + " __ ";
}
}
}
if (ErrorStrng == "")
{
ErrorStrng = "true";// All Informations is Saved
}
return(ErrorStrng);
}