Entity Framework Db.SaveChanges() not working?

Question

Can u tell me what is the problem?

Solution

If you are using two different instances of the DbContext (the db variable as you named it) then nothing will be saved when you call SaveChanges on a context different than the one where your entities are tracked. You need to use the Attach method first.

db.customer_images.Attach(item);
db.SaveChanges();

However I think in your case you can avoid the attach step if you refactor a bit you code and don't use the DbContext from the entity itself.

Comments

[Liviu Mandras]

what do you mean "is not working"? what is the exception? what EF version are you using? how do you pass the db variable to the Customer entity and to the click handler in the aspx page?

[phil soady]

can you tell us what the error is ? My Crystal ball is in for service

[PsyGnosis]

I am not getting an error. it's not save the values

[PsyGnosis]

db variable in the same class like entity db = new entity(); and also aspx page has different db variable. I think its not working because of that