IDENTITY_INSERT is set to OFF

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Hi guys,

I just want to refresh my knowledge about EF and LinQ thats why I created an app that has the CRUD functionality.Now the problem is that I got the error
"Cannot insert explicit value for identity column in table 'Book' when IDENTITY_INSERT is set to OFF." when executing Add function.I know my code is correct because I always use this code in my previous exercises.

Here is the code in my btnAdd button:

C#

private void CreateBook()
       {
           var book = new Book();
           var addBook = new BookBusinessLayer();
           book.Author = txtAuthor.Text;
           book.Price = decimal.Parse(txtPrice.Text);
           book.Title = txtTitle.Text;
           book.Year = txtYear.Text;
           book.publisherId = int.Parse(dlistPublisher.SelectedValue);//this is Foreign Key
           addBook.AddBook(book);
       }

And when I see the inner exception the value of Book.Id=0
but I didnt set the value of the Book.Id because it is my Primary Key

How should I get rid of this Error

Any comments and Answers will be appreciated :)

Posted 4-Feb-14 13:44pm

The14thNoah

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4 solutions

Solution 1

Turn on identity on the table at the database level.
SET IDENTITY_INSERT Book ON

Posted 4-Feb-14 16:07pm

Abhinav S

Comments

The14thNoah 4-Feb-14 22:16pm

Thanks for your reply
actually that was my choice but all I want is make the Book.Id Autogenerated everytime I add book,so if I turn on the SET_IDENTITY_INSERT
is it still autogenerate the primary key or i will set it manually?

Thanks :)

Solution 2

use this Query

SQL

SET IDENTITY_INSERT Table_Name ON

INSERT INTO Table_Name (ID, name)
VALUES (5, 'David')

SET IDENTITY_INSERT Table_Name OFF

Posted 4-Feb-14 17:52pm

King Fisher

Comments

The14thNoah 5-Feb-14 0:22am

tnx for the reply King_Fisher,i just did what you and Abhinav S suggest,I turn on the IDENTITY_INSERT ON in my database.But the error occur again,I guess it because the Book.Id has value which is zero and I dont know where did it get its value

Solution 3

SET Following properties for BOOK’s table Id Column in database

Identity Specification  Yes

(Is Identity)Yes

Identity Increment 1

Identity Seed  1

Posted 4-Feb-14 18:10pm

Sandeep Singh Shekhawat

Comments

The14thNoah 5-Feb-14 0:28am

All the said properties were the same in my database.The only thing that confused me was that the Book.Id has Value which is zero even though I dont set its value in code behind thats why the error occur I guess
Thanks for the reply :)

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The14thNoah · Accepted Answer · 2014-02-05T18:41:00

Solution 4

I found the answer. .
what a shame for me,
after I set the identity ON in my database THEN update the .edmx file in my solution and then build it :P

Posted 5-Feb-14 18:41pm

The14thNoah