--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Common/Tuple.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,127 @@
+using System;
+
+namespace BLToolkit.Common
+{
+	[Obsolete("Use System.Tuple")]
+	public struct Tuple<T1,T2>
+	{
+		public Tuple(T1 field1, T2 field2)
+		{
+			Field1 = field1;
+			Field2 = field2;
+		}
+
+		public readonly T1 Field1;
+		public readonly T2 Field2;
+
+		public override int GetHashCode()
+		{
+			int hash1 = Field1 == null ? 0 : Field1.GetHashCode();
+			int hash2 = Field2 == null ? 0 : Field2.GetHashCode();
+
+			return ((hash1 << 5) + hash1) ^ hash2;
+		}
+
+		public override bool Equals(object obj)
+		{
+			if (obj is Tuple<T1,T2>)
+			{
+				Tuple<T1,T2> t = (Tuple<T1,T2>)obj;
+
+				return
+					(Field1 == null ? t.Field1 == null : Field1.Equals(t.Field1)) &&
+					(Field2 == null ? t.Field2 == null : Field2.Equals(t.Field2));
+			}
+
+			return false;
+		}
+	}
+
+	[Obsolete("Use System.Tuple")]
+	public struct Tuple<T1,T2,T3>
+	{
+		public Tuple(T1 field1, T2 field2, T3 field3)
+		{
+			Field1 = field1;
+			Field2 = field2;
+			Field3 = field3;
+		}
+
+		public readonly T1 Field1;
+		public readonly T2 Field2;
+		public readonly T3 Field3;
+
+		public override int GetHashCode()
+		{
+			int hash1 = Field1 == null ? 0 : Field1.GetHashCode();
+			int hash2 = Field2 == null ? 0 : Field2.GetHashCode();
+
+			hash1 = ((hash1 << 5) + hash1) ^ hash2;
+			hash2 = Field3 == null ? 0 : Field3.GetHashCode();
+
+			return ((hash1 << 5) + hash1) ^ hash2;
+		}
+
+		public override bool Equals(object obj)
+		{
+			if (obj is Tuple<T1,T2,T3>)
+			{
+				Tuple<T1,T2,T3> t = (Tuple<T1,T2,T3>)obj;
+
+				return
+					(Field1 == null ? t.Field1 == null : Field1.Equals(t.Field1)) &&
+					(Field2 == null ? t.Field2 == null : Field2.Equals(t.Field2)) &&
+					(Field3 == null ? t.Field3 == null : Field3.Equals(t.Field3));
+			}
+
+			return false;
+		}
+	}
+
+	[Obsolete("Use System.Tuple")]
+	public struct Tuple<T1,T2,T3,T4>
+	{
+		public Tuple(T1 field1, T2 field2, T3 field3, T4 field4)
+		{
+			Field1 = field1;
+			Field2 = field2;
+			Field3 = field3;
+			Field4 = field4;
+		}
+
+		public readonly T1 Field1;
+		public readonly T2 Field2;
+		public readonly T3 Field3;
+		public readonly T4 Field4;
+
+		public override int GetHashCode()
+		{
+			int hash1 = Field1 == null ? 0 : Field1.GetHashCode();
+			int hash2 = Field2 == null ? 0 : Field2.GetHashCode();
+
+			hash1 = ((hash1 << 5) + hash1) ^ hash2;
+			hash2 = Field3 == null ? 0 : Field3.GetHashCode();
+
+			hash1 = ((hash1 << 5) + hash1) ^ hash2;
+			hash2 = Field4 == null ? 0 : Field4.GetHashCode();
+
+			return ((hash1 << 5) + hash1) ^ hash2;
+		}
+
+		public override bool Equals(object obj)
+		{
+			if (obj is Tuple<T1,T2,T3,T4>)
+			{
+				Tuple<T1,T2,T3,T4> t = (Tuple<T1,T2,T3,T4>)obj;
+
+				return
+					(Field1 == null ? t.Field1 == null : Field1.Equals(t.Field1)) &&
+					(Field2 == null ? t.Field2 == null : Field2.Equals(t.Field2)) &&
+					(Field3 == null ? t.Field3 == null : Field3.Equals(t.Field3)) &&
+					(Field4 == null ? t.Field4 == null : Field4.Equals(t.Field4));
+			}
+
+			return false;
+		}
+	}
+}