Split the database objects out into a seperate project. Needs renaming in some areas and updates in the installer. Otherwise first version of a proper data DLL file.

AdvertisingProfitControlData/Supplier.cs

@@ -0,0 +1,25 @@
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace AdvertisingProfitControlData
+{
+    public class Supplier
+    {
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
+        public Supplier()
+        {
+            Invoices = new HashSet<Invoice>();
+        }
+
+        public int Id { get; set; }
+
+        [StringLength(256)]
+        public string Name { get; set; }
+
+        [StringLength(256)]
+        public string Description { get; set; }
+
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
+        public virtual ICollection<Invoice> Invoices { get; set; }
+    }
+}