private void btnAdd_Click(object sender, EventArgs e)
        {
            try
            {
                EmployeeEntities Emp = new EmployeeEntities();

                Emp.Name     = txtName.Text;
                Emp.Birthday = dtpBirthday.Value;
                Emp.Address  = txtAddress.Text;
                Emp.Phone    = txtPhone.Text;

                EmpPro.CreateOrUpdate(Emp);
                LoadData();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }
        private void btnAdd_Click(object sender, EventArgs e)
        {
            try
            {
                EmployeeEntities Emp = new EmployeeEntities();

                Emp.Name     = txtName.Text;
                Emp.Birthday = dtpBirthday.Value;
                Emp.Address  = txtAddress.Text;
                Emp.Phone    = txtPhone.Text;
                Emp.Account  = txtAccount.Text.ToLower();
                Emp.Password = Security.Encrypt(txtPassword.Text.ToLower());
                Emp.Role     = 1;

                EmpPro.CreateOrUpdate(Emp);
                LoadData();
                SetNull();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }