Any of those help Couple of things to check: Look in the NerdDinner.dbml's designer.cs file under the RSVP partial class definition and the Dinner partial class definition:
Following NerdDinner tutorial, don't allow duplicate
By : user1825908
Date : March 29 2020, 07:55 AM
will be helpful for those in need My sql database doesn't allow 2 records to be added with the same number. If I try to create a record with a previously used number or edit a record to use a previously used number, it doesn't allow it and returns to the edit/create page with an asterisk by the subcontract number field. I would like to add a Rule Violation for this so an appropriate message can be displayed. I tried adding this: , Try:
it fixes the issue AFAIK, MVC just tries to map the properties that are available in the POST to the parameter that it is provided. Because of that, it does not need to know about the type, it just creates the object with the default constructor and maps the form values to the created object - and that is what you get as the method's parameter value. BTW: You'll also notice that the view output does not contain any reference to the Dinner or DinnerFormViewModel classes.
What is a good VB.NET ASP.NET MVC tutorial that isn't NerdDinner?