Add project files.

StockDal/AppConnection.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RepositoryPattern
+{
+
+    public class StockDBConnection
+    {
+        public static string ConnectionString => ConfigurationManager.ConnectionStrings["StockDB"].ConnectionString;
+    }
+}