Add Outlook Inspired and Stock Market demos

OutlookInspiredApp/DevExpress.DevAV/DatabaseObject.cs

@@ -0,0 +1,19 @@
+using System;
+using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Runtime.Serialization;
+using DevExpress.Common;
+
+namespace DevExpress.DevAV {
+    public abstract class DatabaseObject : IDataErrorInfo {
+        [Key]
+        public long Id { get; set; }
+        #region IDataErrorInfo
+        string IDataErrorInfo.Error { get { return null; } }
+        string IDataErrorInfo.this[string columnName] {
+            get { return IDataErrorInfoHelper.GetErrorText(this, columnName); }
+        }
+        #endregion
+    }
+}