--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Validation/ValidationContext.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,119 @@
+using System;
+using System.ComponentModel;
+using System.Reflection;
+using BLToolkit.Mapping;
+using BLToolkit.Reflection;
+
+namespace BLToolkit.Validation
+{
+	public class ValidationContext
+	{
+		public delegate bool IsNullHandler(ValidationContext context);
+
+		private object _object;
+		public  object  Object
+		{
+			get { return _object;  }
+			set { _object = value; }
+		}
+
+		private TypeAccessor _typeAccessor;
+		public  TypeAccessor  TypeAccessor
+		{
+			get
+			{
+				if (_typeAccessor == null)
+					_typeAccessor = TypeAccessor.GetAccessor(_object.GetType());
+
+				return _typeAccessor;
+			}
+		}
+
+		private PropertyDescriptor _propertyDescriptor;
+		public  PropertyDescriptor  PropertyDescriptor
+		{
+			get { return _propertyDescriptor;  }
+			set { _propertyDescriptor = value; }
+		}
+
+		private IsNullHandler _isNull;
+		public  IsNullHandler  IsNull
+		{
+			get { return _isNull;  }
+			set { _isNull = value; }
+		}
+
+		public  bool IsValueNull
+		{
+			get { return _isNull(this);  }
+		}
+
+		private object _value;
+		public  object  Value
+		{
+			get { return _value;  }
+			set
+			{
+				_value     = value;
+				_nullValue = null;
+			}
+		}
+
+		private MemberAccessor _memberAccessor;
+		public  MemberAccessor  MemberAccessor
+		{
+			get { return _memberAccessor; }
+			set 
+			{
+				_memberAccessor = value;
+				_memberInfo     = value != null? value.MemberInfo: null;
+			}
+		}
+
+		private MemberInfo _memberInfo;
+		public  MemberInfo  MemberInfo
+		{
+			get { return _memberInfo;  }
+		}
+
+		private object _nullValue;
+		public  object  NullValue
+		{
+			get
+			{
+				if (_nullValue == null)
+				{
+					if (_value == null)
+						throw new InvalidOperationException("NullValue is undefined when Value == null");
+
+					ObjectMapper om = Map.GetObjectMapper(Object.GetType());
+					MemberMapper mm = om[MemberName, true];
+
+					_nullValue =
+						mm != null && mm.MapMemberInfo.Nullable && mm.MapMemberInfo.NullValue != null?
+							mm.MapMemberInfo.NullValue:
+							TypeAccessor.GetNullValue(Value.GetType());
+
+					if (_nullValue == null)
+						_nullValue = DBNull.Value;
+				}
+
+				return _nullValue;
+
+			}
+		}
+
+		public string MemberName
+		{
+			get
+			{
+				return
+					_memberInfo         != null? _memberInfo.Name:
+#if !SILVERLIGHT
+					_propertyDescriptor != null? _propertyDescriptor.Name:
+#endif
+						null;
+			}
+		}
+	}
+}