Add project files.

ConstructorApp.DataAccessLayer/EntityFramework/EfReferenceDal.cs

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+using ConstructorApp.DataAccessLayer.Abstract;
+using ConstructorApp.DataAccessLayer.Concrete;
+using ConstructorApp.DataAccessLayer.Repositories;
+using ConstructorApp.EntityLayer.Entities;
+
+namespace ConstructorApp.DataAccessLayer.EntityFramework
+{
+    public class EfReferenceDal : GenericRepository<Reference>, IReferenceDal
+    {
+        private readonly ConstructorContext context;
+        public EfReferenceDal(ConstructorContext context) : base(context)
+        {
+            this.context = context;
+        }
+
+        public int CountAll()
+        {
+            return context.References.Count();
+        }
+    }
+}