Insert And Update A Table In Single Web Page

A problem has come up in designing a Web page to maintain a small reference table in SQL Server 2000 (9 columns, about 25 records).

I tried to design the Web page to allow INSERT and UPDATE operations using a single page that posts back to itself. The page contains a set of empty form fields for a new record, followed by a set of filled-in form field for each row in the table. The form fields for existing records are given a unique name based on the field name concatenated with the primary key value for that row.

If I set up the page to INSERT only, it works properly. But when I add the fields for existing records, the INSERT operation malfunctions. Specifically, anytime a set of existing fields for a particular column is added to the page, the INSERT will no longer work properly for that column. This is true for all fields except the primary key field. It always INSERTs correctly. I tried adding only some columns to the set of existing form fields. In that case, the INSERT operation added the correct values for the fields that were not listed in the existing records section, but failed for the others.

I am using the INSERT INTO syntax for that operation and the recordset .Update syntax for the edits. I tried using the recordset .AddNew/.Update syntax for the insert, but it exhibited the same problems. The column data types contain smallint, bit, nvarchar, and ntext types.

I know that the correct values are being put into the INSERT statement. I also tried renaming the INSERT form fields to be totally different than the names of the existing record fields. But the problem comes back no matter what.

If necessary, I can split the logic so that inserts and updates are handled by different pages. But I would like to make this work if possible. If a reader knows why SQL Server is causing this problem, any help would be greatly appreciated.