Question

Problems when saving object in LINQ/C#

when i try to save a new record i get this error:

Cannot insert the value NULL into column 'EmpresaID', table 'mydb.dbo.Empresa'; column does not allow nulls. INSERT fails.
The statement has been terminated.

Was Made the table with SQL Server Management Studio 2012

USE [mydb]
GO

/****** Object:  Table [dbo].[Empresa]    Script Date: 25/04/2012 03:40:00 p.m. ******/
DROP TABLE [dbo].[Empresa]
GO

/****** Object:  Table [dbo].[Empresa]    Script Date: 25/04/2012 03:40:00 p.m. ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[Empresa](
    [EmpresaID] [int] NOT NULL,
    [RazonSocial] [nvarchar](210) NOT NULL,
    [Nit] [nchar](20) NOT NULL,
 CONSTRAINT [PK_Empresa] PRIMARY KEY CLUSTERED 
(
    [EmpresaID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

i made a class for handle the data

[Table(Name = "Empresa")]
class Empresa
{
    private int _EmpresaID;
    private string _RazonSocial;
    private string _Nit;

    [Column(DbType = "int", IsPrimaryKey = true, IsDbGenerated = true)]
    public int EmpresaID
    {
        set { _EmpresaID = value; }
        get { return _EmpresaID; }
    }

    [Column(DbType = "nvarchar(210)", CanBeNull = false)]
    public string RazonSocial
    {
        set { _RazonSocial = value; }
        get { return _RazonSocial; }
    }

    [Column(DbType = "nchar(20)", CanBeNull = false)]
    public string Nit
    {
        set { _Nit = value; }
        get { return _Nit; }
    }

}

made and which method is this:

Entity.Empresa empresa = new Entity.Empresa() {                
    Nit = NuevaEmpresaNitTxtBox.Text,
    RazonSocial = NuevaEmpresaRazonSocialTxtBox.Text
};

MyDataContext.GetTable<Entity.Empresa>().InsertOnSubmit(empresa);
MyDataContext.SubmitChanges();

can tell me was worng with my code?

Answer 1

You forgot to declare Identity on EmpressaId. 🙂