public int GetStudentsNumber(Group group)
{
int number;
using (StudentsBL studentsBl = new StudentsBL())
{
number = studentsBl.GetList().Count(stud => stud.GroupNumber == group.GroupNumber);
}
return(number);
}
static void Main(string[] args)
{
StudentsBL bl = new StudentsBL();
Console.WriteLine(bl.GetList().Count());
Student stud = new Student {
FullName = "Test"
};
bl.Add(stud);
Console.WriteLine(bl.GetList().Count());
Console.ReadKey();
}