--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Data/Sql/JoinOn.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace BLToolkit.Data.Sql
+{
+	using Reflection.Extension;
+
+	public class JoinOn : IQueryElement, ICloneableElement
+	{
+		public JoinOn()
+		{
+		}
+
+		public JoinOn(string field, string otherField)
+		{
+			_field      = field;
+			_otherField = otherField;
+		}
+
+		public JoinOn(string field, string otherField, string expression)
+		{
+			_field      = field;
+			_otherField = otherField;
+			_expression = expression;
+		}
+
+		public JoinOn(AttributeExtension ext)
+		{
+			_field      = (string)ext["Field"];
+			_otherField = (string)ext["OtherField"];
+			_expression = (string)ext["Expression"];
+		}
+
+		private string _field;
+		public  string  Field { get { return _field; } set { _field = value; } }
+
+		private string _otherField;
+		public  string  OtherField { get { return _otherField; } set { _otherField = value; } }
+
+		private string _expression;
+		public  string  Expression { get { return _expression; } set { _expression = value; } }
+
+		#region IQueryElement Members
+
+		public QueryElementType ElementType { get { return QueryElementType.JoinOn; } }
+
+		StringBuilder IQueryElement.ToString(StringBuilder sb, Dictionary<IQueryElement,IQueryElement> dic)
+		{
+			return sb;
+		}
+
+		#endregion
+
+		#region ICloneableElement Members
+
+		public ICloneableElement Clone(Dictionary<ICloneableElement, ICloneableElement> objectTree, Predicate<ICloneableElement> doClone)
+		{
+			if (!doClone(this))
+				return this;
+
+			ICloneableElement clone;
+
+			if (!objectTree.TryGetValue(this, out clone))
+				objectTree.Add(this, clone = new JoinOn(_field, _otherField, _expression));
+
+			return clone;
+		}
+
+		#endregion
+	}
+}