private void Update(object obj)
        {
            isNew              = false;
            FirstName          = SelectedEmployee.FirstName;
            LastName           = SelectedEmployee.LastName;
            Salary             = SelectedEmployee.Salary;
            Age                = SelectedEmployee.Age;
            City               = SelectedEmployee.City;
            SelectedEnterprise = SelectedEmployee.Enterprise;
            Window objPopupwindow = new CreateOrUpdateEmployeeView();

            objPopupwindow.DataContext = this;
            objPopupwindow.ShowDialog();
        }
        private void Create(object obj)
        {
            isNew              = true;
            FirstName          = null;
            LastName           = null;
            Salary             = null;
            Age                = 0;
            City               = null;
            isNew              = true;
            SelectedEnterprise = null;
            Window objPopupwindow = new CreateOrUpdateEmployeeView();

            objPopupwindow.DataContext = this;
            objPopupwindow.ShowDialog();
        }