--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/PromiseTransientException.cs	Sun Jan 11 19:13:02 2015 +0300
@@ -0,0 +1,33 @@
+using System;
+
+namespace Implab {
+
+    [Serializable]
+    public class PromiseTransientException : Exception {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PromiseTransientException"/> class.
+        /// </summary>
+        /// <param name="inner">The exception that is the cause of the current exception.</param>
+        public PromiseTransientException(Exception inner) : base("The preceding promise has failed", inner) {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PromiseTransientException"/> class
+        /// </summary>
+        /// <param name="message">A <see cref="T:System.String"/> that describes the exception. </param>
+        /// <param name="inner">The exception that is the cause of the current exception. </param>
+        public PromiseTransientException(string message, Exception inner)
+            : base(message, inner) {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PromiseTransientException"/> class
+        /// </summary>
+        /// <param name="context">The contextual information about the source or destination.</param>
+        /// <param name="info">The object that holds the serialized object data.</param>
+        protected PromiseTransientException(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context)
+            : base(info, context) {
+        }
+    }
+}
+