public CollegeService(IAllDepartments allDepartments, IAllStudent allStudent, IStudentAndDepartment studentAndDepartment, ICrudStudent crudStudent, ICrudDepartment crudDepartment)
 {
     this.allDepartments       = allDepartments;
     this.allStudent           = allStudent;
     this.studentAndDepartment = studentAndDepartment;
     this.crudStudent          = crudStudent;
     this.crudDepartment       = crudDepartment;
 }
 public static int Count(this IAllStudent allStudent)
 {
     return(allStudent.DisplayAllStudent().Count);
 }