diff --git a/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj b/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj
index 6bdaf411..873bdfb4 100644
--- a/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj
+++ b/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj
@@ -62,6 +62,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Http.Extensions" Version="2.1.21" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
     <PackageReference Include="Microsoft.IdentityModel.Tokens" Version="7.2.0" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="8.0.0" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="7.2.0" />
   </ItemGroup>
 
diff --git a/AsbCloudInfrastructure/MemoryCacheExtentions.cs b/AsbCloudInfrastructure/MemoryCacheExtentions.cs
index eb57af3f..85956230 100644
--- a/AsbCloudInfrastructure/MemoryCacheExtentions.cs
+++ b/AsbCloudInfrastructure/MemoryCacheExtentions.cs
@@ -46,10 +46,7 @@ namespace AsbCloudInfrastructure
         /// <returns></returns>
         public static Task<IEnumerable<T>> GetOrCreateBasicAsync<T>(this IMemoryCache memoryCache, Func<CancellationToken, Task<IEnumerable<T>>> getterAsync, CancellationToken token)
         {
-            var key = typeof(T).FullName;
-            if (key == null)
-                return Task.FromResult(Enumerable.Empty<T>());
-
+            var key = typeof(T).FullName!;
             var cache = memoryCache.GetOrCreateAsync(key, async (cacheEntry) =>
             {
                 cacheEntry.AbsoluteExpirationRelativeToNow = CacheOlescence;
@@ -87,7 +84,7 @@ namespace AsbCloudInfrastructure
         /// <returns></returns>
         public static IEnumerable<T> GetOrCreateBasic<T>(this IMemoryCache memoryCache, Func<IEnumerable<T>> getter)
         {
-            var key = typeof(T).FullName;
+            var key = typeof(T).FullName!;
             var cache = memoryCache.GetOrCreate(key, cacheEntry =>
             {
                 cacheEntry.AbsoluteExpirationRelativeToNow = CacheOlescence;
@@ -106,10 +103,7 @@ namespace AsbCloudInfrastructure
         public static void DropBasic<T>(this IMemoryCache memoryCache)
             where T : class
         {
-            var key = typeof(T).FullName;
-
-            if (key == null)
-                return;
+            var key = typeof(T).FullName!;
 
             memoryCache.Remove(key);
         }
diff --git a/AsbCloudInfrastructure/Services/Email/BaseFactory.cs b/AsbCloudInfrastructure/Services/Email/BaseFactory.cs
index c0431016..b48d77ed 100644
--- a/AsbCloudInfrastructure/Services/Email/BaseFactory.cs
+++ b/AsbCloudInfrastructure/Services/Email/BaseFactory.cs
@@ -2,6 +2,7 @@
 using AsbCloudApp.Exceptions;
 using Microsoft.Extensions.Configuration;
 using System;
+using System.Configuration;
 using System.IO;
 
 namespace AsbCloudInfrastructure.Services.Email
@@ -9,17 +10,24 @@ namespace AsbCloudInfrastructure.Services.Email
 
     public class BaseFactory
     {
-        private readonly string platformName;
-        private readonly string platformUrl;
-        private readonly string companyName;
-        private readonly string supportMail;
+        protected readonly string platformName;
+        protected readonly string platformUrl;
+        protected readonly string companyName;
+        protected readonly string supportMail;
 
         public BaseFactory(IConfiguration configuration)
         {
-            platformName = configuration.GetValue("email:platformName", "Цифровое бурение") ?? string.Empty;
-            platformUrl = configuration.GetValue("email:platformUrl", "https://cloud.digitaldrilling.ru/") ?? string.Empty;
-            companyName = configuration.GetValue("email:companyName", "ООО \"Цифровое бурение\"") ?? string.Empty;
-            supportMail = configuration.GetValue("email:supportMail", "support@digitaldrilling.ru") ?? string.Empty;
+            platformName = configuration.GetValue<string>("email:platformName")
+                ?? throw new ConfigurationErrorsException("email:platformName не определен");
+
+            platformUrl = configuration.GetValue<string>("email:platformUrl")
+                ?? throw new ConfigurationErrorsException("email:platformUrl не определен");
+
+            companyName = configuration.GetValue<string>("email:companyName")
+                ?? throw new ConfigurationErrorsException("email:companyName не определен");
+
+            supportMail = configuration.GetValue<string>("email:supportMail")
+                 ?? throw new ConfigurationErrorsException("email:supportMail не определен");
         }
 
         public static string GetOrEmptyImageBase64(string resourceFileName)
@@ -37,7 +45,7 @@ namespace AsbCloudInfrastructure.Services.Email
             {
                 System.Diagnostics.Trace.TraceWarning($"GetOrEmptyImageBase64(). File {logoFilePath} not found.");
                 return string.Empty;
-            }                
+            }
 
             var imageBytes = File.ReadAllBytes(logoFilePath);
             var format = Path.GetExtension(resourceFileName).Trim('.');
diff --git a/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs b/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs
index d1371110..ac1d4771 100644
--- a/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs
+++ b/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs
@@ -4,83 +4,79 @@ using Microsoft.Extensions.Configuration;
 namespace AsbCloudInfrastructure.Services.Email
 {
 
-	class DrillingMailBodyFactory : BaseFactory
+    class DrillingMailBodyFactory : BaseFactory
     {
-		private readonly string platformName;
-        private readonly string platformUrl;
 
         public DrillingMailBodyFactory(IConfiguration configuration)
-			: base(configuration)	
+            : base(configuration)
         {
-			platformName = configuration.GetValue("email:platformName", "Цифровое бурение") ?? string.Empty;
-			platformUrl = configuration.GetValue("email:platformUrl", "https://cloud.digitaldrilling.ru/") ?? string.Empty;
-		}
+        }
 
-		public override string MakeSubject(WellDto well, string action)
+        public override string MakeSubject(WellDto well, string action)
         {
-			var subj = $"{well.Deposit}, {well.Cluster}, {well.Caption}. Программа бурения. {action}";
-			return subj;
-		}
+            var subj = $"{well.Deposit}, {well.Cluster}, {well.Caption}. Программа бурения. {action}";
+            return subj;
+        }
 
-		public string MakeMailBodyForNewPublisher(WellDto well, string publisherName, string documentCategory)
-		{
-			var drillingProgramHref = MakeDrillingProgramHref(well);
-
-			var body = $"<html><body><h2>Здравствуйте, {publisherName}.</h2>" +
-				$"На портале {platformName} началось создание программы бурения скважины {drillingProgramHref}," +
-				$" куст {well.Cluster}, месторождение {well.Deposit}." +
-				$"<br><br>От вас ожидается загрузка на портал документа «{documentCategory}» в формате excel (*.xlsx)." + 
-				MakeSignatue() +
-				$"</body></html>";
-			return body;
-		}
-
-		public string MakeMailBodyForApproverNewFile(WellDto well, string approverName, int idFile, string fileName)
+        public string MakeMailBodyForNewPublisher(WellDto well, string publisherName, string documentCategory)
         {
-			var drillingProgramHref = MakeDrillingProgramHref(well);
+            var drillingProgramHref = MakeDrillingProgramHref(well);
 
-			var body = $"<html><body><h2>Здравствуйте, {approverName}.</h2>" +
-                $"На портал {platformName} загружен документ {fileName}" +
-				$" для согласования при создании программы бурения скважины {drillingProgramHref}, куст ({well.Cluster})" +
-				$", месторождение ({well.Deposit}).<br>" +
+            var body = $"<html><body><h2>Здравствуйте, {publisherName}.</h2>" +
+                $"На портале {platformName} началось создание программы бурения скважины {drillingProgramHref}," +
+                $" куст {well.Cluster}, месторождение {well.Deposit}." +
+                $"<br><br>От вас ожидается загрузка на портал документа «{documentCategory}» в формате excel (*.xlsx)." +
                 MakeSignatue() +
                 $"</body></html>";
-			return body;
-		}
+            return body;
+        }
 
-		public string MakeMailBodyForPublisherOnReject(WellDto well, string publisherName, int idFile, string fileName, FileMarkDto fileMark)
-		{
-			var drillingProgramHref = MakeDrillingProgramHref(well);
-
-			var body = $"<html><body><h2>Здравствуйте, {publisherName}.</h2>" +
-				$"На портале {platformName} отклонен загруженный вами документ {fileName} " +
-                $" по программе бурения скважины {drillingProgramHref}," +
-				$" куст {well.Cluster}, месторождение {well.Deposit}." +
-				$" Комментарий согласующего ({fileMark.User?.Name} {fileMark.User?.Surname}):<br>{fileMark.Comment}" +
-				MakeSignatue() +
-				$"</body></html>";
-			return body;
-		}
-
-		public string MakeMailBodyForPublisherOnFullAccept(WellDto well, string publisherName, int idFile, string fileName)
-		{
-			var drillingProgramHref = MakeDrillingProgramHref(well);
-
-			var body = $"<html><body><h2>Здравствуйте, {publisherName}.</h2>" +
-				$"На портале {platformName} полностью согласован документ {fileName} " +
-				$" по программе бурения скважины {drillingProgramHref}," +
-				$" куст {well.Cluster}, месторождение {well.Deposit}." +
-				MakeSignatue() +
-				$"</body></html>";
-			return body;
-		}
-
-		private string MakeDrillingProgramHref(WellDto well)
+        public string MakeMailBodyForApproverNewFile(WellDto well, string approverName, int idFile, string fileName)
         {
-			var drillingProgramUrl = $"{platformUrl}/well/{well.Id}/drillingProgram";
-			var drillingProgramHref = MakeHref(drillingProgramUrl, well.Caption);
-			return drillingProgramHref;
-		}
-	}
+            var drillingProgramHref = MakeDrillingProgramHref(well);
+
+            var body = $"<html><body><h2>Здравствуйте, {approverName}.</h2>" +
+                $"На портал {platformName} загружен документ {fileName}" +
+                $" для согласования при создании программы бурения скважины {drillingProgramHref}, куст ({well.Cluster})" +
+                $", месторождение ({well.Deposit}).<br>" +
+                MakeSignatue() +
+                $"</body></html>";
+            return body;
+        }
+
+        public string MakeMailBodyForPublisherOnReject(WellDto well, string publisherName, int idFile, string fileName, FileMarkDto fileMark)
+        {
+            var drillingProgramHref = MakeDrillingProgramHref(well);
+
+            var body = $"<html><body><h2>Здравствуйте, {publisherName}.</h2>" +
+                $"На портале {platformName} отклонен загруженный вами документ {fileName} " +
+                $" по программе бурения скважины {drillingProgramHref}," +
+                $" куст {well.Cluster}, месторождение {well.Deposit}." +
+                $" Комментарий согласующего ({fileMark.User?.Name} {fileMark.User?.Surname}):<br>{fileMark.Comment}" +
+                MakeSignatue() +
+                $"</body></html>";
+            return body;
+        }
+
+        public string MakeMailBodyForPublisherOnFullAccept(WellDto well, string publisherName, int idFile, string fileName)
+        {
+            var drillingProgramHref = MakeDrillingProgramHref(well);
+
+            var body = $"<html><body><h2>Здравствуйте, {publisherName}.</h2>" +
+                $"На портале {platformName} полностью согласован документ {fileName} " +
+                $" по программе бурения скважины {drillingProgramHref}," +
+                $" куст {well.Cluster}, месторождение {well.Deposit}." +
+                MakeSignatue() +
+                $"</body></html>";
+            return body;
+        }
+
+        private string MakeDrillingProgramHref(WellDto well)
+        {
+            var drillingProgramUrl = $"{platformUrl}/well/{well.Id}/drillingProgram";
+            var drillingProgramHref = MakeHref(drillingProgramUrl, well.Caption);
+            return drillingProgramHref;
+        }
+    }
 
 }
diff --git a/AsbCloudInfrastructure/Services/Email/EmailNotificationTransportService.cs b/AsbCloudInfrastructure/Services/Email/EmailNotificationTransportService.cs
index 88fbe691..6812e068 100644
--- a/AsbCloudInfrastructure/Services/Email/EmailNotificationTransportService.cs
+++ b/AsbCloudInfrastructure/Services/Email/EmailNotificationTransportService.cs
@@ -4,6 +4,7 @@ using AsbCloudApp.Repositories;
 using AsbCloudApp.Services.Notifications;
 using Microsoft.Extensions.Configuration;
 using System.Collections.Generic;
+using System.Configuration;
 using System.Diagnostics;
 using System.Linq;
 using System.Net.Mail;
@@ -29,9 +30,14 @@ namespace AsbCloudInfrastructure.Services.Email
         {
             this.userRepository = userRepository;
 
-            this.sender = configuration.GetValue("email:sender", string.Empty) ?? string.Empty;
-            this.smtpPassword = configuration.GetValue("email:password", string.Empty) ?? string.Empty;
-            this.smtpServer = configuration.GetValue("email:smtpServer", string.Empty) ?? string.Empty;
+            this.sender = configuration.GetValue<string>("email:sender")
+                ?? throw new ConfigurationErrorsException("email:sender не определен");
+
+            this.smtpPassword = configuration.GetValue<string>("email:password")
+                ?? throw new ConfigurationErrorsException("email:password не определен");
+
+            this.smtpServer = configuration.GetValue<string>("email:smtpServer")
+                ?? throw new ConfigurationErrorsException("email:smtpServer не определен");
 
             var configError = string.IsNullOrEmpty(this.sender) ||
                 string.IsNullOrEmpty(this.smtpPassword) ||
diff --git a/AsbCloudInfrastructure/Services/HelpPageService.cs b/AsbCloudInfrastructure/Services/HelpPageService.cs
index 45d4d18d..012ce5bc 100644
--- a/AsbCloudInfrastructure/Services/HelpPageService.cs
+++ b/AsbCloudInfrastructure/Services/HelpPageService.cs
@@ -1,11 +1,11 @@
 using AsbCloudApp.Data;
 using AsbCloudApp.Repositories;
 using AsbCloudApp.Services;
+using Microsoft.Extensions.Configuration;
 using System.IO;
 using System.Net;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.Extensions.Configuration;
 
 namespace AsbCloudInfrastructure.Services;
 
@@ -14,7 +14,7 @@ namespace AsbCloudInfrastructure.Services;
 /// </summary>
 public class HelpPageService : IHelpPageService
 {
-    private readonly string directoryNameHelpPageFiles; 
+    private readonly string directoryNameHelpPageFiles;
     private readonly IHelpPageRepository helpPageRepository;
     private readonly IFileStorageRepository fileStorageRepository;
 
@@ -27,13 +27,10 @@ public class HelpPageService : IHelpPageService
     public HelpPageService(IHelpPageRepository helpPageRepository,
         IFileStorageRepository fileStorageRepository,
         IConfiguration configuration)
-    {        
+    {
         this.helpPageRepository = helpPageRepository;
         this.fileStorageRepository = fileStorageRepository;
-        directoryNameHelpPageFiles = configuration.GetValue<string>("DirectoryNameHelpPageFiles") ?? string.Empty;
-
-        if (string.IsNullOrWhiteSpace(directoryNameHelpPageFiles))
-            directoryNameHelpPageFiles = "helpPages";
+        directoryNameHelpPageFiles = configuration.GetValue("DirectoryNameHelpPageFiles", "helpPages")!;
     }
 
     /// <summary>
@@ -45,17 +42,17 @@ public class HelpPageService : IHelpPageService
     /// <param name="fileStream"></param>
     /// <param name="cancellationToken"></param>
     /// <returns></returns>
-    public async Task<int> AddOrUpdateAsync(string urlPage, 
-        int idCategory, 
-        string fileName, 
-        Stream fileStream, 
+    public async Task<int> AddOrUpdateAsync(string urlPage,
+        int idCategory,
+        string fileName,
+        Stream fileStream,
         CancellationToken cancellationToken)
     {
         var helpPage = await helpPageRepository.GetOrDefaultByUrlPageAndIdCategoryAsync(urlPage,
             idCategory,
             cancellationToken);
 
-        if(helpPage is not null)
+        if (helpPage is not null)
         {
             await UpdateFileAsync(helpPage,
                 idCategory,
@@ -86,12 +83,12 @@ public class HelpPageService : IHelpPageService
         CancellationToken cancellationToken)
     {
         pageKey = WebUtility.UrlDecode(pageKey);
-        
+
         var helpPage = await helpPageRepository.GetOrDefaultByUrlPageAndIdCategoryAsync(pageKey,
             idCategory,
             cancellationToken);
-        
-        if(helpPage is null)
+
+        if (helpPage is null)
             return null;
 
         string filePath = fileStorageRepository.GetFilePath(directoryNameHelpPageFiles,
diff --git a/AsbCloudInfrastructure/Services/ManualCatalogService.cs b/AsbCloudInfrastructure/Services/ManualCatalogService.cs
index 7776a4ef..83d24f4b 100644
--- a/AsbCloudInfrastructure/Services/ManualCatalogService.cs
+++ b/AsbCloudInfrastructure/Services/ManualCatalogService.cs
@@ -35,10 +35,7 @@ public class ManualCatalogService : IManualCatalogService
 		this.fileStorageRepository = fileStorageRepository;
 		this.manualDirectoryRepository = manualDirectoryRepository;
 		this.manualRepository = manualRepository;
-		directoryFiles = configuration.GetValue<string>("DirectoryManualFiles") ?? string.Empty;
-
-		if (string.IsNullOrWhiteSpace(directoryFiles))
-			directoryFiles = "manuals";
+		directoryFiles = configuration.GetValue<string>("DirectoryManualFiles", "manuals")!;
 	}
 
 	public async Task<int> SaveFileAsync(int idDirectory, int idAuthor, string name, Stream stream, CancellationToken cancellationToken)
diff --git a/AsbCloudInfrastructure/Services/ReduceSamplingService.cs b/AsbCloudInfrastructure/Services/ReduceSamplingService.cs
index 7fc7e19c..38d6a03e 100644
--- a/AsbCloudInfrastructure/Services/ReduceSamplingService.cs
+++ b/AsbCloudInfrastructure/Services/ReduceSamplingService.cs
@@ -6,6 +6,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using System;
 using System.Collections.Generic;
+using System.Configuration;
 using System.Diagnostics;
 using System.Linq;
 using System.Threading;
@@ -36,7 +37,8 @@ namespace AsbCloudInfrastructure.Services
 
         private ReduceSamplingService(IConfiguration configuration)
         {
-            connectionString = configuration.GetConnectionString("DefaultConnection") ?? string.Empty;
+            connectionString = configuration.GetConnectionString("DefaultConnection")
+                 ?? throw new ConfigurationErrorsException("DefaultConnection не определен");
         }
 
         ~ReduceSamplingService()