diff --git a/Demo/Data/LocalData/LocalStaticData.cs b/Demo/Data/LocalData/LocalStaticData.cs
index d82d881..aebb784 100644
--- a/Demo/Data/LocalData/LocalStaticData.cs
+++ b/Demo/Data/LocalData/LocalStaticData.cs
@@ -18,7 +18,7 @@ namespace Demo.Data.LocalData
             new GroupLocalEntity{ Id = 3, Name = "ИП1-23" },
         };
 
-        public static IEnumerable<UserLocalEnity> users => new List<UserLocalEnity>
+        public static List<UserLocalEnity> users => new List<UserLocalEnity>
         {
             new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio", GroupID = 1 },
             new UserLocalEnity{Guid=Guid.NewGuid(), FIO = "RandomFio1", GroupID = 2 },
diff --git a/Demo/Data/Repository/UserRepositoryImpl.cs b/Demo/Data/Repository/UserRepositoryImpl.cs
index f4cbbc6..9d802fd 100644
--- a/Demo/Data/Repository/UserRepositoryImpl.cs
+++ b/Demo/Data/Repository/UserRepositoryImpl.cs
@@ -1,4 +1,6 @@
-using System;
+using Demo.Data.LocalData;
+using Demo.domain.Models;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -6,7 +8,38 @@ using System.Threading.Tasks;
 
 namespace Demo.Data.Repository
 {
-    internal class UserRepositoryImpl
+    public class UserRepositoryImpl
     {
+        public IEnumerable<UserLocalEnity> GetAllUsers() => LocalStaticData.users;
+
+        public bool RemoveUserByGuid(Guid userGuid)
+        {
+            UserLocalEnity? userLocal = LocalStaticData
+                .users
+                .Where(x => x.Guid == userGuid).FirstOrDefault();
+            if (userLocal == null) return false;
+
+            return LocalStaticData.users.Remove(userLocal);
+        }
+
+        public UserLocalEnity? GetUserByGuid(Guid userGuid) {
+            UserLocalEnity? userLocal = LocalStaticData
+                    .users
+                    .Where(x => x.Guid == userGuid).FirstOrDefault();
+            if (userLocal == null) return null;
+
+            return userLocal;
+        }
+
+        public UserLocalEnity? UpdateUserByGuid(UserLocalEnity userUpdateLocalEnity) {
+            UserLocalEnity? userLocal = LocalStaticData
+                    .users
+                    .Where(x => x.Guid == userUpdateLocalEnity.Guid).FirstOrDefault();
+            if (userLocal == null) return null;
+            userLocal.FIO = userUpdateLocalEnity.FIO;
+            userLocal.GroupID = userUpdateLocalEnity.GroupID;
+            return userLocal;
+
+        }
     }
 }
diff --git a/Demo/Demo.csproj b/Demo/Demo.csproj
index e338845..1ea2759 100644
--- a/Demo/Demo.csproj
+++ b/Demo/Demo.csproj
@@ -9,7 +9,6 @@
 
   <ItemGroup>
     <Folder Include="Data\RemoteData\" />
-    <Folder Include="Domain\UseCase\" />
   </ItemGroup>
 
 </Project>
diff --git a/Demo/Domain/UseCase/UserUseCase.cs b/Demo/Domain/UseCase/UserUseCase.cs
new file mode 100644
index 0000000..b98a077
--- /dev/null
+++ b/Demo/Domain/UseCase/UserUseCase.cs
@@ -0,0 +1,20 @@
+using Demo.Data.Repository;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.Domain.UseCase
+{
+    public class UserUseCase
+    {
+        private UserRepositoryImpl _repositoryImpl;
+
+        public UserUseCase(UserRepositoryImpl repositoryImpl)
+        {
+            _repositoryImpl = repositoryImpl;
+        }
+
+    }
+}