How to insert value into primary key identity column in SQL through C#?

Question

(My problem solved. As almost everyone said I had to remove @OB_ID and left it to SQL to assign value.)

I want to insert a new record into a table in SQL database th

Answer 1

you can ignore IDENTITY column as it will be inserted by default.

Try This

SqlConnection sqlc = new SqlConnection();
sqlc.ConnectionString = "Data Source=. ; Database=LDatabase; Integrated Security=true;";
SqlCommand cmd2 = new SqlCommand("INSERT INTO Order_Book VALUES(@OB_Title, @OB_Author, @OB_TranslatedBy, @OB_Publisher)", sqlc);//@OB_ID is indentity primary key

cmd2.Parameters.AddWithValue("@OB_Title", "%" + txtboxbook.Text + "%");
cmd2.Parameters.AddWithValue("@OB_Author", "%" + txtboxAuthor.Text + "%");
cmd2.Parameters.AddWithValue("@OB_TranslatedBy", "%" + txtboxTranslator.Text + "%");
cmd2.Parameters.AddWithValue("@OB_Publisher", "%" + txtboxPublisher.Text + "%");
sqlc.Open();
cmd2.ExecuteNonQuery();
sqlc.Close();

Answer 2

You souldn't put the id in your request. SQLServer will add the good identity at insertion.

SqlConnection sqlc = new SqlConnection();
sqlc.ConnectionString = "Data Source=. ; Database=LDatabase; Integrated Security=true;";

SqlCommand cmd2 = new SqlCommand("INSERT INTO Order_Book VALUES( @OB_Title,    @OB_Author, @OB_TranslatedBy, @OB_Publisher)", sqlc);//@OB_ID is indentity primary key
        cmd2.Parameters.AddWithValue("@OB_Title", "%" + txtboxbook.Text + "%");
        cmd2.Parameters.AddWithValue("@OB_Author", "%" + txtboxAuthor.Text + "%");
        cmd2.Parameters.AddWithValue("@OB_TranslatedBy", "%" + txtboxTranslator.Text +  "%");
        cmd2.Parameters.AddWithValue("@OB_Publisher", "%" + txtboxPublisher.Text + "%");
        sqlc.Open();
        cmd2.ExecuteNonQuery();
        sqlc.Close();

Answer 3

Replace Following

SqlCommand cmd2 = new SqlCommand("INSERT INTO Order_Book VALUES( @OB_Title,    @OB_Author, @OB_TranslatedBy, @OB_Publisher)", sqlc);
//@OB_ID is indentity primary key

With

SqlCommand cmd2 = new SqlCommand("SET IDENTITY_INSERT Order_Book ON;INSERT INTO Order_Book VALUES( @OB_Title,    @OB_Author, @OB_TranslatedBy, @OB_Publisher);SET IDENTITY_INSERT Order_Book OFF;", sqlc);
 //@OB_ID is indentity primary key

Answer 4

You don't need to add anything as SQL Server will automatically increment and assign the Identity field. So, simply remove @OB_ID and SQL Server will know to add the next key in sequence, so...

SqlConnection sqlc = new SqlConnection();
sqlc.ConnectionString = "Data Source=. ; Database=LDatabase; Integrated Security=true;";

SqlCommand cmd2 = new SqlCommand("INSERT INTO Order_Book VALUES(@OB_Title, @OB_Author,     @OB_TranslatedBy, @OB_Publisher)", sqlc);
        cmd2.Parameters.AddWithValue("@OB_Title", "%" + txtboxbook.Text + "%");
        cmd2.Parameters.AddWithValue("@OB_Author", "%" + txtboxAuthor.Text + "%");
        cmd2.Parameters.AddWithValue("@OB_TranslatedBy", "%" + txtboxTranslator.Text + "%");
        cmd2.Parameters.AddWithValue("@OB_Publisher", "%" + txtboxPublisher.Text + "%");
        sqlc.Open();
        cmd2.ExecuteNonQuery();
        sqlc.Close();