Moved numpad control to Tanshu.Common. Billing feature complete. Delete not working as expected

Signed-off-by: unknown <tanshu@.(none)>

Tanshu.Accounts.Contracts/Attributes/CascadeAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Tanshu.Accounts.Contracts
+{
+    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
+    public class CascadeAttribute : Attribute
+    {
+        private string message = string.Empty;
+        public string Message
+        {
+            get { return message; }
+            set { message = value; }
+        }
+    }
+}

Tanshu.Accounts.Contracts/Attributes/NotNullAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Tanshu.Accounts.Contracts
+{
+    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
+    public class NotNullAttribute : Attribute
+    {
+        private string message = string.Empty;
+        public string Message
+        {
+            get { return message; }
+            set { message = value; }
+        }
+    }
+}

Tanshu.Accounts.Contracts/Attributes/SecutiryAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Tanshu.Accounts.Contracts
+{
+    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
+    public class SecurityAttribute : Attribute
+    {
+        private string message = string.Empty;
+        public string Message
+        {
+            get { return message; }
+            set { message = value; }
+        }
+    }
+}