Refactoring - split data, logic and model layers; custom network exception

StudentHouseDashboard/Data/SqlConnectionHelper.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Data.SqlClient;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Data
+{
+    public static class SqlConnectionHelper
+    {
+        private static string connectionString = "Server=mssqlstud.fhict.local;Database=dbi509645;User Id=dbi509645;Password=sNPNBm*BX!6z8RM;";
+        public static SqlConnection CreateConnection()
+        {
+            SqlConnection connection = new SqlConnection(connectionString);
+            try
+            {
+                connection.Open();
+            }
+            catch (SqlException e)
+            {
+                throw new DatabaseNetworkException("Unable to access FHICT VDI database", e);
+                // Console.WriteLine("Database connection error. Are you connected to the VDI VPN?");
+            }
+
+            return connection;
+        }
+    }
+}