Integrating Validation with the Entity Framework: Listing 2.
Throwing an exception for a Changing method.
namespace northwindModel
{
public partial class Customer
{
partial void OnCityChanging(string value)
{
if (value.Length > 25)
{
throw new Exception(
"City name must be less than 26 characters long");
}
}
}
}
About the Author
Peter Vogel is a system architect and principal in PH&V Information Services. PH&V provides full-stack consulting from UX design through object modeling to database design. Peter tweets about his VSM columns with the hashtag #vogelarticles. His blog posts on user experience design can be found at http://blog.learningtree.com/tag/ui/.