private void DgvManagers_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)//select the manager to updating or deactiving
        {
            BtnAdd.Hide();
            BtnUpdate.Show();
            BtnDeactive.Show();
            BtnCancel.Show();
            TxtPassword.Hide();
            LblPassword.Text = "New Password";
            LblComment.Show();
            TxtNewPassword.Show();
            int Id = Convert.ToInt32(DgvManagers.Rows[e.RowIndex].Cells[0].Value);

            _selectedManager = _managerService.Find(Id);

            //index of selected manager on datagridview
            _selectedIndex = e.RowIndex;
            //fill the selected manager information to the textboxes
            TxtName.Text     = _selectedManager.Name;
            TxtSurname.Text  = _selectedManager.Surname;
            TxtPhone.Text    = _selectedManager.Phone;
            TxtUsername.Text = _selectedManager.Username;
            if (_selectedManager.IsAdmin == true)
            {
                CmbPosition.SelectedIndex = 0;
                return;
            }
            CmbPosition.SelectedIndex = 1;
        }
 // Update Fill MEthods//
 public void FilUpdateData()
 {
     TxtName.Text    = _manager.Name;
     TxtSurname.Text = _manager.Surname;
     TxtAge.Text     = Convert.ToInt32(_manager.Age).ToString();
     TxtEmail.Text   = _manager.Email;
     TxtPhone.Text   = _manager.Phone;
     TxtPassword.Hide();
     LblPassword.Hide();
     BtnSave.Location   = new System.Drawing.Point(24, 256);
     BtnCancel.Location = new System.Drawing.Point(94, 256);
     BtnSave.Text       = "Update";
     this.Text          = "Yenile";
 }