This solution should help me explain my desire

SharedLibrary/Models/RepositoryException.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SharedLibrary.Models
+{
+    public class RepositoryException : Exception
+    {
+        
+    }
+}