How to update primary key field (or Part of primary key field) using MVC (Entity Framework)

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table: Country
{
Country varchar(50)
}

sample Data:
Country
1. India
2. USA

What I want is Update Country field. But its primary key. So i got following error.
The property 'Country' is part of the object's key information and cannot be modified.

So please help me how to achieve this task.

Thanks in advance...

Posted 8-Mar-11 23:53pm

Dave Paras

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CodeHawkz · Answer 1 · 2011-03-09T00:30:00

Hi there...

You can update any field in a table. The reason, why you cannot edit the primary key value here, is that it (the primary key) has been referenced by another table as a foreign key. You will have to drop/change any referencing rows in other tables in order to update this "Country" column.

On a side note, in real world the best practice is to create a table called "Country" with 2 columns. One integer column which is the primary key called "ID" and the other column a varchar(50) named "description". You can make the ID column an auto-incremental field to reduce the hassle and make the "Description" column a unique index. Update the other tables to refer to the "ID" column as a foreign key. The key advantage in this approach is, you can change the description which is the name of the country to anything else without updating the ID, which I think what you want to achieve :)

Hope this helps

Regards, Pasan.

soheila3155 · Answer 2 · 2013-11-09T19:02:00

Solution 2

This link can help http://stackoverflow.com/questions/3187963/the-property-id-is-part-of-the-objects-key-information-and-cannot-be-modified[^]

Posted 9-Nov-13 19:02pm

soheila3155