Asynhronic response from Web Service

I need to generate XML from myWebService to another Web Service but only when Table.field in database is with value "0". When myWebService get information that "field" is with value "0" or field are inserted, myWebService need to generate XML and change Table.field value to "1".

How would myWebService know when the value of "field" is changed to "0" or inserted in Table with value "0" (I need some methodology which would trigger my Web service at any time when it occurs - Web Service in Web Service).
Some code example would be appropriate.

novabankaeeAsked:
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elimesikaCommented:
HI

OK, than you are left with the 1st option , this is the easiest solution to implement and it might meet your needs if the update rate is not extensive.

Another option, if you have any control on the service that updates the service, you may use messaging to send a message from updating service to the other service.
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elimesikaCommented:
HI

You have several options

1) pooling - creating  a timer object and check for the value each X seconds

2) Use Cache Dependency on the table
http://msdn.microsoft.com/en-us/library/ms178604.aspx

3) create a CLR stored procedure that will be called from a trigger on the table

http://msdn.microsoft.com/en-us/library/ms131094.aspx


I highly recommend the 2nd option

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novabankaeeAuthor Commented:
I don't use MS Sql Server so 2nd and 3rd options are not in options.
I use Informix database. This is more database then Visual studio (C#) releated problem. Isn't it?
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novabankaeeAuthor Commented:
How and where to implement Timer Object in WebServis?

public class MyWebService : System.Web.Services.WebService
    {
 
        public MyWebService()
        {
        }
 
        [WebMethod]
        public string WebMethod1()
        {
            //Business Logic
        }
 
        public void PrivateMethod1()
        {
            //Business Logic
        }
   }

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