Question

A little background… I have a .NET webpage that communicates one way with a service. (using OnCustomCommand()) When the user presses a button, a function is called. Which is all good and dandy, however when the function is done executing I need to be able to send a message, function call, or some communication to the .NET webpage.

Is there a way for my service to call a function, send message or update my .Net webpage?

I’ve looked around and seen mostly .NET -> Service but nothing seems to go the other way.

EDIT: Its a windows service, and the ASP page and WindowsService reside on the same server.

Answer 1

Have the service write the output to a common area… such as a shared file, or a database. Then refresh the webpage and have it query that file for the response output.

Support more than one user you should have have some session ID that will be used to determine where the output is saved. For example, call a command line parameter with a GUID like this:

 Echo This is a test > c:\Some Directory\Session12345.txt

And then have your aspx page query and refresh using a GET like this http://example.com/GetOutput.aspx?Session=12345

From there use ASP to access a file with an appended SessionID in the URL.

You can extend this concept to work with JQuery and WCF as needed. Of course, you will need to add security to this to prevent MITM attacks. But it sounds like this is a small project not connected to the internet so the extra features may not be that important.