Visual studio - IDENTITY_INSERT is set to OFF

I'm trying to add records to a local database using Visual Studio 2015 and linq to sql commands, but I get an error IDENTITY_INSERT is set to OFF.

I'm not inserting a value for the primary key and Identity Specification is set to True. This is the generated script file:

CREATE TABLE [dbo].[MONTE_CARLO] (
    [PK]        INT             IDENTITY (1, 1) NOT NULL,
    [ID]        INT             NOT NULL,
    [BOOK_COMP] NCHAR (10)      NOT NULL,
    [GREEK]     NCHAR (10)      NOT NULL,
    [DP1]       DECIMAL (18, 6) NOT NULL,
    [DP2]       DECIMAL (18, 6) NOT NULL,
    [DP3]       DECIMAL (18, 6) NOT NULL,
    [DP4]       DECIMAL (18, 6) NOT NULL,
    [DP5]       DECIMAL (18, 6) NOT NULL,
    [DP6]       DECIMAL (18, 6) NOT NULL,
    [DP7]       DECIMAL (18, 6) NOT NULL,
    [DP8]       DECIMAL (18, 6) NOT NULL,
    [DP9]       DECIMAL (18, 6) NOT NULL,
    [DP10]      DECIMAL (18, 6) NOT NULL,
    [DP11]      DECIMAL (18, 6) NOT NULL,
    [DP12]      DECIMAL (18, 6) NOT NULL,
    [DP13]      DECIMAL (18, 6) NOT NULL,
    [DP14]      DECIMAL (18, 6) NOT NULL,
    [DP15]      DECIMAL (18, 6) NOT NULL,
    [DP16]      DECIMAL (18, 6) NOT NULL,
    [DP17]      DECIMAL (18, 6) NOT NULL,
    [DP18]      DECIMAL (18, 6) NOT NULL,
    [DP19]      DECIMAL (18, 6) NOT NULL,
    [DP20]      DECIMAL (18, 6) NOT NULL,
    [DP21]      DECIMAL (18, 6) NOT NULL,
    CONSTRAINT [PK_MONTE_CARLO] PRIMARY KEY CLUSTERED ([PK] ASC)
);

This is the code to update the datatable. I'm passing a dictionary (dct)to the function which handles the updating.

Dim mcQuery = From updtMC In DATA.MONTE_CARLOs        'ID exists so update data
                          Where updtMC.ID = CStr(dct("ID")) And updtMC.BOOK_COMP = CStr(dct("BOOK_COMP")) And updtMC.GREEK = CStr(dct("GREEK"))
                          Select updtMC
            For Each updtMC As MONTE_CARLO In mcQuery

                updtMC.ID = dct("ID")
                updtMC.BOOK_COMP = dct("BOOK_COMP")
                updtMC.GREEK = dct("GREEK")
                updtMC.DP1 = dct("DP1")
                updtMC.DP2 = dct("DP2")
                updtMC.DP3 = dct("DP3")
                updtMC.DP4 = dct("DP4")
                updtMC.DP5 = dct("DP5")
                updtMC.DP6 = dct("DP6")
                updtMC.DP7 = dct("DP7")
                updtMC.DP8 = dct("DP8")
                updtMC.DP9 = dct("DP9")
                updtMC.DP10 = dct("DP10")
                updtMC.DP11 = dct("DP11")
                updtMC.DP12 = dct("DP12")
                updtMC.DP13 = dct("DP13")
                updtMC.DP14 = dct("DP14")
                updtMC.DP15 = dct("DP15")
                updtMC.DP16 = dct("DP16")
                updtMC.DP17 = dct("DP17")
                updtMC.DP18 = dct("DP18")
                updtMC.DP19 = dct("DP19")
                updtMC.DP20 = dct("DP20")
                updtMC.DP21 = dct("DP21")
            Next
        End If

        DATA.SubmitChanges()

linq to sql files for Monte_Carlo:

<Global.System.Data.Linq.Mapping.TableAttribute(Name:="dbo.MONTE_CARLO")>  _
Partial Public Class MONTE_CARLO
    Implements System.ComponentModel.INotifyPropertyChanging, System.ComponentModel.INotifyPropertyChanged

    Private Shared emptyChangingEventArgs As PropertyChangingEventArgs = New PropertyChangingEventArgs(String.Empty)

    Private _PK As Integer

    Private _ID As Integer

    Private _BOOK_COMP As String

    Private _GREEK As String

    Private _DP1 As Decimal

    Private _DP2 As Decimal

    Private _DP3 As Decimal

    Private _DP4 As Decimal

    Private _DP5 As Decimal

    Private _DP6 As Decimal

    Private _DP7 As Decimal

    Private _DP8 As Decimal

    Private _DP9 As Decimal

    Private _DP10 As Decimal

    Private _DP11 As Decimal

    Private _DP12 As Decimal

    Private _DP13 As Decimal

    Private _DP14 As Decimal

    Private _DP15 As Decimal

    Private _DP16 As Decimal

    Private _DP17 As Decimal

    Private _DP18 As Decimal

    Private _DP19 As Decimal

    Private _DP20 As Decimal

    Private _DP21 As Decimal

    Private _BOOK As EntityRef(Of BOOK)

Based on naming conventions in entity framework columns with name Id are considered as Id, probably you are having this problem. Try to change the name of field ID.