using SchoolAgainStudyContracts.ViewModel; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace SchoolAgainStudyContracts.BusinessLogicContracts { public interface IChartLogic { public (int Products, int Diyes) GetDifferenceInCount(int StudentId); public List GetActivitys(int StudentId); } }