Sample Download : http://code.msdn.microsoft.com/CSSharepointGetListIDFromLi-354a5a6f
The sample will show you how to get the list ID, name from the list url by using web service. In this sample, we use Lists.GetListCollection Method of list web Services. It will return a System.Xml.XmlNode object. You can get the value of the attribute “DefaultViewUrl” and append it to site url. After that, you should compare the url with your list url, and then find the list ID value.
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