private void CB_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Teams_Tbl a1 = (Teams_Tbl)CB.SelectedItem;

            if (a1 == null)
            {
                TeamS.Text  = "";
                TeamN.Text  = "";
                Ecombo.Text = "";
                TeamL.Text  = "";

                return;
            }
            TeamN.Text = a1.TeamName;
            TeamS.Text = a1.TeamStartDate;
            if (a1.TeamEmployee == null)
            {
                Ecombo.Text = "";
            }
            else
            {
                Ecombo.Text = a1.Employees_Tbl.EmpName;
            }


            TeamL.Text = a1.TeamLevel;
        }
        private void Update_Click(object sender, RoutedEventArgs e)
        {
            Teams_Tbl a1 = (Teams_Tbl)CB.SelectedItem;
            Teams_Tbl a2 = (from s in db.Teams_Tbl where s.TeamId == a1.TeamId select s).FirstOrDefault();

            a2.TeamStartDate    = TeamS.Text;
            a2.TeamName         = TeamN.Text;
            a2.TeamLevel        = TeamL.Text;
            a2.TeamEmployee     = (Ecombo.SelectedItem as Employees_Tbl).EmpId;
            a2.TeamEmployeeName = (Ecombo.SelectedItem as Employees_Tbl).EmpName;

            db.SaveChanges();
            updateCB();
            UpdateDGV();
        }
        private void Add_click(object sender, RoutedEventArgs e)
        {
            String Name  = TeamN.Text;
            String Date  = TeamS.Text;
            String Level = TeamL.Text;
            String Ename = (Ecombo.SelectedItem as Employees_Tbl).EmpName;
            int    Emp   = (Ecombo.SelectedItem as Employees_Tbl).EmpId;


            /*בודק שהוכנסו כל הנתונים שהם חובה
             * EmpN name of textBox*/
            if (TeamL.Text == "" || TeamN.Text == "" || Ecombo.Text == "")
            {
                this.Title = "Erorr";
                return;
            }

            /*   שומר את הנתונים שהוקלדו והוכנסו אל המשתנים המתאימים בטבלה
             * EmpName השם של העמודה בטבלה*/
            Teams_Tbl a1 = new Teams_Tbl();

            a1.TeamStartDate    = Date;
            a1.TeamName         = Name;
            a1.TeamEmployee     = Emp;
            a1.TeamLevel        = Level;
            a1.TeamEmployeeName = Ename;


            db.Teams_Tbl.Add(a1);
            db.SaveChanges();
            this.Title = "Employee Add";

            TeamS.Text  = "";
            TeamN.Text  = "";
            Ecombo.Text = "";
            TeamL.Text  = "";

            this.Title = "sucsses";
            UpdateDGV();
            updateCB();
        }