# Wednesday, 10 March 2010
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In my last post I pointed to a screencast I had recorded that showed how to create a custom message filter to plug your own logic into the WCF 4.0 Routing Service. However, the simple custom filter is only the start – you can actually take control of part of the routing table which allows you to make global decisions about which filters match a particular request. On that basis I have created another screencast that shows how to build one of these more complex custom filters. in this case I use the example of a round robin load balancer where you can use a file on the file system to indicate whether a specific endpoint should be considered part of the load balancing algorithm

You can find this last in the series of screencasts on the routing service, along with all the others here, on the Rock Solid Knowledge site