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

Hcs.TestApp/ClientDemo/FileStoreDemo.cs

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+using Hcs.ClientApi;
+using System;
+using System.IO;
+using System.Threading;
+
+namespace Hcs.ClientDemo
+{
+    public class FileStoreDemo
+    {
+        public static void DemoDownloadFile(HcsClient hcsClient)
+        {
+            Guid fileGuid = new Guid("e4c3b39f-ad59-11ef-bc8e-0242ac120002");
+
+            var file = hcsClient.FileStoreService.DownloadFile(
+                fileGuid, HcsFileStoreContext.homemanagement, CancellationToken.None).Result;
+            Console.WriteLine("\nКонтент len=" + file.Length +
+                " type=" + file.ContentType + " streamLength=" + file.Stream.Length +
+                " hash=" + hcsClient.ComputeGost94Hash(file.Stream));
+
+            using (var s = new FileStream(@"D:\temp\teplo0.pdf", FileMode.CreateNew, FileAccess.Write))
+            {
+                file.Stream.Seek(0, SeekOrigin.Begin);
+                file.Stream.CopyTo(s);
+                s.Close();
+            }
+        }
+
+        public static void DemoUploadFile(HcsClient hcsClient)
+        {
+            string sourceFileName = @"D:\temp\Проект договора.docx";
+
+            var contentType = HcsFile.GetMimeContentTypeForFileName(sourceFileName);
+            if (contentType == null) throw new HcsException("Не найден тип mime для файла");
+
+            Console.WriteLine("Выгружаем файл: " + sourceFileName);
+            using (var stream = new FileStream(sourceFileName, FileMode.Open, FileAccess.Read))
+            {
+                var file = new HcsFile(Path.GetFileName(sourceFileName), contentType, stream);
+                var guid = hcsClient.FileStoreService.UploadFile(
+                    file, HcsFileStoreContext.homemanagement, CancellationToken.None).Result;
+                Console.WriteLine("Выгруженный файл GUID=" + guid);
+            }
+        }
+
+        public static void DemoGetFileLength(HcsClient hcsClient)
+        {
+            Guid fileGuid = new Guid("33ddc355-60bd-4537-adf6-fbb31322e16f");
+            var length = hcsClient.FileStoreService.GetFileLength(
+                HcsFileStoreContext.homemanagement, fileGuid, CancellationToken.None).Result;
+            Console.WriteLine($"\nДлина = {length} для файла с GUID " + fileGuid);
+        }
+
+        public static void DemoGostHash(HcsClient hcsClient)
+        {
+            PrintFileHash(hcsClient, @"D:\temp\teplo0.pdf");
+        }
+
+        public static void PrintFileHash(HcsClient hcsClient, string fileName)
+        {
+            using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
+            {
+                var hash = hcsClient.ComputeGost94Hash(stream);
+                Console.WriteLine($"{fileName} hash=" + hash + " len=" + new FileInfo(fileName).Length);
+            }
+        }
+    }
+}