Hey guys i have a member property witch is sql:Autocomplete (ucompononentes) umbraco v6. And what is saved in that is field is a xml file or a simulation of it , and this is how i edit if ! PS: this only works if i already got something there so i can Parse it and just add new line in xml. 

using System.Xml.Linq;        

XDocument xDocument = XDocument.Parse(member.getproperty("alias").value.ToString());

xDocument.Root.Add(new XElement(
                            "Item", 
                            new XAttribute("Text", "some text"),
                            new XAttribute("Value", "some value")));

member.getproperty("alias").value = xDocument.ToString();

But in the field if i have nothing and i need to start something i cant, its not stored.. cant understand why.. if u can help me pls tell. i already tryed this

XDocument doc = new XDocument();
                                   doc.Root.Add(
                                        new XElement("SqlAutoComplete",
                                          new XElement( "Item",
                                           new XAttribute("Text", "lol"),
                                           new XAttribute("Value", "123"))));
                                    
                                    member.getProperty("alias").Value = doc.ToString();