public FrmStaff(Guid?id = null) { InitializeComponent(); if (id != null) { getId = Guid.Parse(id.ToString()); DataTable dt = StaffDao.GetStaffById(getId); if (dt != null) { txtName.Text = dt.Rows[0]["Name"].ToString(); txtSalary.Text = dt.Rows[0]["Salary"].ToString(); dtpHireDate.Value = DateTime.Parse(dt.Rows[0]["HireDate"].ToString()); dtpStopDate.Value = DateTime.Parse(dt.Rows[0]["StopDate"].ToString()); pic = StaffDao.GetPhoto(getId); if (pic != null) { picStaff.Image = Helpers.ByteArrayToImage(pic); } } } }