private bool UpdateData()
        {
            using (MyAcademyEntities db = new MyAcademyEntities())
            {
                Models.Task UpdatedData = db.Tasks.Where(x => x.ID_task == SelectedID).FirstOrDefault();
                if (GoCheck.IsEmpityOrMaxChar(textBoxName.Text) && GoCheck.IsStringValue(textBoxName.Text))
                {
                    UpdatedData.Name_task = GoCheck.ClearValue;
                }
                else
                {
                    return(false);
                }
                if (GoCheck.isDate(dateTimeDeadline.Value))
                {
                    UpdatedData.DeadLine = dateTimeDeadline.Value;
                }
                else
                {
                    return(false);
                }

                return(GoCheck.isSave(db.SaveChanges()));
            }
        }
        private bool Create()
        {
            using (MyAcademyEntities db = new MyAcademyEntities())
            {
                Models.Task Newdata = new Models.Task();

                if (GoCheck.IsEmpityOrMaxChar(textBoxName.Text) && GoCheck.IsStringValue(textBoxName.Text))
                {
                    Newdata.Name_task = GoCheck.ClearValue;
                }
                else
                {
                    return(false);
                }
                if (GoCheck.isDate(dateTimeDeadline.Value))
                {
                    Newdata.DeadLine    = dateTimeDeadline.Value;
                    Newdata.Status_task = true;
                }
                else
                {
                    return(false);
                }
                db.Tasks.Add(Newdata);
                return(GoCheck.isSave(db.SaveChanges()));
            }
        }