Question

I am getting the following error:

InnerException: {“Cannot insert the value NULL into column ‘UserId’, table ‘database.dbo.bp_UserDetails’; column does not allow nulls. INSERT fails. The statement has been terminated.”}

The problem is that UserId has a value of 12.

My table is defined as

CREATE TABLE [dbo].[bp_UserDetails](
[UserId] [int] NOT NULL,
[Name] [varchar](50) NULL.
    // Other fields
CONSTRAINT [PK_bp_UserDetails] PRIMARY KEY CLUSTERED 
(
[UserId] ASC
)
WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,
       ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

My model:

[Table("bp_UserDetails")]
public class UserDetails
{
    [Key]
    public int UserId { get; set; }
    [DisplayName("Customer name")]
    public string Name { get; set; }
}

Any ideas why I may be getting this error?

Answer 1

Set DatabaseGeneratedOption to None for the key property in your model:

[Key, DatabaseGenerated(DatabaseGeneratedOption.None)]
public int UserId { get; set; }

If you don’t do this EF assumes by default that the UserId is generated in the database as an identity column and never sends the value to the server.