private void LoadEmployee()
{
List <User> list = userPresenter.GetAllEmployee();
if (list.Count == 0)
{
MessageBox.Show("This employee'name doesn't exist!");
}
else
{
txtUserID.ReadOnly = true;
dgvEmployeeList.DataSource = list;
dgvEmployeeList.Columns.Remove("Password");
txtUserID.Text = "";
txtUserName.Text = "";
txtAddress.Text = "";
txtPhone.Text = "";
txtEmail.Text = "";
txtRoleID.Text = "";
}
}