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

Hcs.Client/ClientApi/HcsUtil.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Hcs.ClientApi
+{
+    public class HcsUtil
+    {
+        /// <summary>
+        /// Возвращает описание исключения одной строкой
+        /// </summary>
+        public static string DescribeException(Exception e)
+        {
+            string separator = "";
+            var buf = new StringBuilder();
+            buf.Append("[");
+            foreach (var inner in EnumerateInnerExceptions(e))
+            {
+                buf.Append(separator);
+                buf.Append(inner.GetType().Name);
+                buf.Append(":");
+                buf.Append(inner.Message);
+                separator = "-->";
+            }
+
+            buf.Append("]");
+            return buf.ToString();
+        }
+
+        /// <summary>
+        /// Возвращает список все вложенных исключений для данного исключения
+        /// </summary>
+        public static List<Exception> EnumerateInnerExceptions(Exception e)
+        {
+            var list = new List<Exception>();
+            WalkInnerExceptionsRecurse(e, list);
+            return list;
+        }
+
+        private static void WalkInnerExceptionsRecurse(Exception e, List<Exception> list)
+        {
+            if (e == null || list.Contains(e)) return;
+            list.Add(e);
+
+            WalkInnerExceptionsRecurse(e.InnerException, list);
+
+            if (e is AggregateException)
+            {
+                var aggregate = e as AggregateException;
+                foreach (var inner in aggregate.InnerExceptions)
+                {
+                    WalkInnerExceptionsRecurse(inner, list);
+                }
+            }
+        }
+
+        public static string FormatGuid(Guid guid) => guid.ToString();
+
+        public static Guid ParseGuid(string guid)
+        {
+            try
+            {
+                return Guid.Parse(guid);
+            }
+            catch (Exception e)
+            {
+                throw new HcsException($"Невозможно прочитать GUID из строки [{guid}]", e);
+            }
+        }
+
+        public static string FormatDate(DateTime date)
+        {
+            return date.ToString("yyyyMMdd");
+        }
+
+        public static string FormatDate(DateTime? date)
+        {
+            return (date == null) ? string.Empty : FormatDate((DateTime)date);
+        }
+
+        /// <summary>
+        /// Преобразует массиб байтов в строку в формате binhex
+        /// </summary>
+        public static string ConvertToHexString(byte[] ba)
+        {
+            var buf = new StringBuilder(ba.Length * 2);
+            foreach (byte b in ba) buf.AppendFormat("{0:x2}", b);
+            return buf.ToString();
+        }
+    }
+}