1 files changed, 27 insertions, 0 deletions
diff --git a/BackEnd/Timeline/Services/EntityNotExistException.cs b/BackEnd/Timeline/Services/EntityNotExistException.cs
new file mode 100644
index 00000000..39a4f545
--- /dev/null
+++ b/BackEnd/Timeline/Services/EntityNotExistException.cs
@@ -0,0 +1,27 @@
+using System;
+
+namespace Timeline.Services
+{
+    /// <summary>
+    /// Thrown when you want to get an entity that does not exist.
+    /// </summary>
+    /// <example>
+    /// For example, you want to get a timeline with given name but it does not exist.
+    /// </example>
+    [Serializable]
+    public class EntityNotExistException : Exception
+    {
+        public EntityNotExistException() : this(null, null) { }
+        public EntityNotExistException(string? entityName) : this(entityName, null) { }
+        public EntityNotExistException(string? entityName, Exception? inner) : this(entityName, null, inner) { }
+        public EntityNotExistException(string? entityName, string? message, Exception? inner) : base(message ?? Resource.ExceptionEntityNotExist, inner)
+        {
+            EntityName = entityName;
+        }
+        protected EntityNotExistException(
+          System.Runtime.Serialization.SerializationInfo info,
+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
+
+        public string? EntityName { get; }
+    }
+}