Question

Why doesn’t this work? I get an error saying the number cannot be infinity. However, I had to take this away from an insert statement so that it doesn’t post entries twice.
Where do I have to incorporate this piece of code to get it to allow my code to loop as a new ID?

            cmd = new SqlCommand(@"SELECT CAST(scope_identity() as int)", con);

            int aID = Convert.ToInt32(cmd.ExecuteScalar());

Answer 1

In general you can have a stored procedure to do the INSERT and return the last inserted identity with an out parameter, as you can see in an example here: http://www.objectreference.net/post/SCOPE_IDENTITY()-return-the-id-from-the-database-on-insert.aspx

CREATE PROCEDURE [dbo].[Customer_Insert]
    @Name VARCHAR(255),
    @Email VARCHAR(255),
    @Phone VARCHAR(255),
    @CustomerID INT OUTPUT
AS
BEGIN
    INSERT INTO dbo.Customer ([Name], Email, Phone)
    VALUES (@Name,@Email,@Phone)

    SET @CustomerID = CAST(SCOPE_IDENTITY() AS INT)
END