Web Reference: I had a similar problem and upon looking into it, it was simply a field in the actual table missing id (id was empty/null) - meaning when you try to make the id field the primary key it will result in error because the table contains a row with null value for the primary key. Sep 28, 2024 · To fix this issue, insert a non-NULL value. Here’s an example of code that produces the error: Output: Cannot insert the value NULL into column 'CatId', table 'demo.dbo.Cats'; column does not allow nulls. INSERT fails. Mar 2, 2026 · Fix "Cannot insert NULL into column 'Srno'" in SQL Server when Srno should auto-increment. Learn a production-safe solution involving temporary tables and foreign keys.
YouTube Excerpt: https://codedocu.com/Details?d=2139&a=10&f=352&l=0 System.Data.SqlClient.SqlException occurred HResult=0x80131904 ...
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