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Basic formatting applied. Unnecessary comments have been removed. Suspicious code is covered by TODO.

Hcs.Client/GostXades/XadesBesValidationException.cs

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+using System;
+using System.Runtime.Serialization;
+
+namespace Hcs.GostXades
+{
+    [Serializable]
+    public class XadesBesValidationException : Exception
+    {
+        public XadesBesValidationException()
+        {
+        }
+
+        public XadesBesValidationException(string message) : base(message)
+        {
+        }
+
+        public XadesBesValidationException(string message, Exception inner) : base(message, inner)
+        {
+        }
+
+        protected XadesBesValidationException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+}