#region DataMinig
    [DataContract]
    [KnownType(typeof(SQLException))]
    [KnownType(typeof(ThickException))]
    public class WCFException
    {
        private string message;
        private string stackTrace;
        public WCFException(string message,string stackTrace)
        {
            this.message = message;
            this.stackTrace = stackTrace;
        }
        [DataMember]
        public string Message { set; get; }
        [DataMember]
        public string StackTrace { set; get; }
    }
    [DataContract]
    public class SQLException : WCFException
    {
        public SQLException(string message, string stackTrace)
            : base(message, stackTrace)
        {
        }
    }
    [DataContract]
    public class ThickException : WCFException
    {
        public ThickException(string message, string stackTrace)
            : base(message, stackTrace)
        {
        }
    }
    [ServiceContract(SessionMode = SessionMode.Required)]
    public interface IGetData
    {
        /// <summary>
        /// Gets set of XML for TabPages
        /// </summary>
        /// <param name="role"> Users role </param>
        [OperationContract]
        [FaultContract(typeof(SQLException))]
        [FaultContract(typeof(ThickException))]
        DataTable GetXML(int role);
    }
    #endregion