AddOrUpdateAppointmentForm now populates values when modifying appointment

C969Project/Data/Models/Customer.cs

@@ -10,4 +10,9 @@ public class Customer
     public string CreatedBy { get; set; }
     public DateTime LastUpdate { get; set; }
     public string LastUpdateBy { get; set; }
+
+    public override string ToString()
+    {
+        return CustomerName;
+    }
 }