Part of working with Web Services is pushing data to SharePoint. There are numerous Blogs and articles that show you how to update, delete and add new list items. One of the things you will want to do is add metadata, specifically adding values to "User/Group" columns. The problem is that SharePoint has a specific format that needs to be followed. If you look closely, underneath the covers SharePoint keeps an 'ID;#username' format. You might be wondering, "What is the ID for? and where does it come ......