Broadcast Error Messages to subscribers

Question

Hi there, I have a problem and would like to hear experts' advices. I made a web application in C# and ASP.Net that depends on Services (e.g. MSSQL and my company's self made legacy Services). But when one of the Services is down, client applications and my other web pages are crashed too. I want to notify all of my pages and clients to handle the exception caused by the down Service. Can anyone guide me please - which model or pattern? At the moment, i have a thread that checks the Services status. But i am not sure how to send the message to clients and other web pages. Any help would be greatful. Regards, Kai