[WebMethod]
        public Playlist GetPlayList(string user, string password)
        {
        }

Code
    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.1432")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType = false)]
    [System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
    [System.Xml.Serialization.SoapInclude(typeof(Playlist))]
    [XmlInclude(typeof(Playlist))]
    public partial class Playlist
    {

        private List<PlaylistChannel> itemsField = new List<PlaylistChannel>();

        /// <remarks/>
        [System.Xml.Serialization.XmlElementAttribute("Channel", Form = System.Xml.Schema.XmlSchemaForm.Unqualified)]
        public List<PlaylistChannel> Channels
        {
            get
            {
                return this.itemsField;
            }
            set
            {
                this.itemsField = value;
            }
        }
    }