Want to check if any records exist in ClientAccessCode table, if not return false... 

if (!CheckAccessCodeExists())
{
   
Console.WriteLine("Client Access code does not exist");
    throw new ConfigurationErrorsException("Client Access code does not exist");
} 
private static bool CheckAccessCodeExists()
{
    using (EPOSEntities db = new EPOSEntities())
    {
       
ClientAccountAccess clientAccess = db.ClientAccountAccesses
                .OrderByDescending(x => x.Id)               
.Take(1)               
.Single();
 
        if(clientAccess != null)
        {
            return true;
        }
        return false;
    }
}

//this is flagging sequence contains no elements, in the lamba expression, so how can I just return false then? some use of .Any() perhaps?

Thanks