I am umanath, I use Microsoft Gynamic GP10.0, how to write web services to update data in side GP10.0 ?

And i choose eConnect to retrive & Update data into GP10.0 back end data. So this way is correct or not ?

Finaly which web methods are avilable in GP10.0 for i will write new web services ?

What are the web metodes available for write web services in Dynamic Greate Plains? Please give Sample for update backend table data through web services