Consuming Web Service (Dynamically Changing URL)

Question

Hi All,

            I am working on Asp.NET (C#).  I am developing one shopping Portal which Consumes Web Survives such as Yahoo, Amazon.  As some web service provider hosts same services on different server for reliably purpose (In Case One server is down then in mean time these services can be availed from Server2 or if server 2 is also down then these services can be consumed from server3.),so URL will be different in All these servers.

            I want to use these services in my application, so How to dynamically change these URL in my ASP.NET application.

 

 

Thanks in Advance

Shivendra