Web Reference: If you do not mention any field in the fields list for insert it'll be supposed to be null or default value. Set identity (i.e. autoincrement) for this field if you do not want to set it manualy every time. 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. Oct 3, 2022 · It seems that there is a null in your data source, please have a double check. In addition, please check the mapping, you do not need to map the column [ProdID], it will automatically create incrementing number when other columns have been assigned values.
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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