/// <summary>
/// return true if the username exists
/// else false
/// </summary>
/// <param name="userName"></param>
/// <returns></returns>
public bool IsExistedUsername(string userName)
{
try
{
NhanVienAccess nvAc = new NhanVienAccess();
return(nvAc.IsExistedUsername(userName));
}
catch (Exception ex)
{
throw ex;
}
}