--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Demo/WebServices/Client/WebClient/Compatibility.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,80 @@
+namespace Demo.WebServices.Client.WebClient
+{
+#if !FW3
+
+	/// <summary>
+	/// Encapsulates a method that takes no parameters and does not return a value.
+	/// </summary>
+	public delegate void Action();
+
+	/// <summary>
+	/// Encapsulates a method that has two parameters and does not return a value.
+	/// </summary>
+	/// <param name="arg1">
+	/// The first parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <param name="arg2">
+	/// The second parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <typeparam name="T1">
+	/// The type of the first parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	/// <typeparam name="T2">
+	/// The type of the second parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	public delegate void Action<T1, T2>(T1 arg1, T2 arg2);
+
+	/// <summary>
+	/// Encapsulates a method that has three parameters and does not return a value.
+	/// </summary>
+	/// <param name="arg1">
+	/// The first parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <param name="arg2">
+	/// The second parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <param name="arg3">
+	/// The third parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <typeparam name="T1">
+	/// The type of the first parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	/// <typeparam name="T2">
+	/// The type of the second parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	/// <typeparam name="T3">
+	/// The type of the third parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	public delegate void Action<T1, T2, T3>(T1 arg1, T2 arg2, T3 arg3);
+
+	/// <summary>
+	/// Encapsulates a method that has four parameters and does not return a value.
+	/// </summary>
+	/// <param name="arg1">
+	/// The first parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <param name="arg2">
+	/// The second parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <param name="arg3">
+	/// The third parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <param name="arg4">
+	/// The fourth parameter of the method that this delegate encapsulates.
+	/// </param>
+	/// <typeparam name="T1">
+	/// The type of the first parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	/// <typeparam name="T2">
+	/// The type of the second parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	/// <typeparam name="T3">
+	/// The type of the third parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	/// <typeparam name="T4">
+	/// The type of the fourth parameter of the method that this delegate encapsulates.
+	/// </typeparam>
+	public delegate void Action<T1, T2, T3, T4>(T1 arg1, T2 arg2, T3 arg3, T4 arg4);
+
+#endif
+}