Add project files.

StockDAL/BackupRepository.cs

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+using DataDomain;
+using DatamodelLibrary;
+using StockDAL.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StockDAL
+{
+    public class BackupRepository : IBackupRepository
+    {
+        public BackupRegister SaveBackupReging(BackupRegister backupRegister)
+        {
+            using var context = new StockContext();
+            var entity = (from brr in context.BackupRegings
+                          where brr.Id == backupRegister.Id
+                          select brr).FirstOrDefault();
+            if (entity == null)
+            {
+                entity = new BackupRegister
+                {
+                    BackedUp = DateTime.Now,
+                    DbName = "Stocks.db",
+                    BackupDbName = backupRegister.BackupDbName,
+                    BackupPath = backupRegister.BackupPath
+                };
+                context.BackupRegings.Add(entity);
+            }
+            else
+            {
+                entity.BackedUp = backupRegister.BackedUp;
+                entity.DbName = backupRegister.DbName;
+                entity.BackupDbName = backupRegister.BackupDbName;
+                entity.BackupPath = backupRegister.BackupPath;
+            }
+
+            context.SaveChanges();
+            return entity;
+        }
+
+
+        public BackupRegister GetBackupRegisterById(int brId)
+        {
+            using var context = new StockContext();
+            var entity = (from br in context.BackupRegings
+                          where br.Id == brId
+                          select br).FirstOrDefault();
+            return entity;
+        }
+
+
+        public IEnumerable<BackupRegister> GetAllBackupRegisters()
+        {
+            using var context = new StockContext();
+            var entities = context.BackupRegings;
+            return entities.ToList();
+        }
+    }
+}