VB.NET ช่วยที่ครับ ใช้ DataSet แล้วมานขึ้น Error แบบนี้อ่ะครับ

Imports System.Data
Imports System.Data.OleDb
Imports System.Data.DataRow


Public Class Class1
    Private conn As New OleDbConnection
    Private dtread As OleDbDataReader
    Private sqlcom As String
    Dim CVNo As String
    Dim FirstName As String
    Dim Lastname As String
    Dim OwnTimes As String
    Dim Phone As String
    Dim DateTimePicker1 As String
    Dim Position As String
    Dim Saturation As String
    Dim StaffTpye As String
    Dim Status As String
    Dim SubSection As String
    Dim date1 As String




    Public Sub Connect()
        With conn
            If .State = ConnectionState.Open Then .Close()
            '  .ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\paweenawat\Documents\Visual Studio 2010\Projects\test_add_delete_select_update\WindowsApplication7\Database11.accdb"
            .ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\PMCBL_ITINV_V0.8.accdb"
            .Open()
        End With
    End Sub


 Public Sub addset(ByVal CVNo As String, ByVal FirstName As String, ByVal Lastname As String, ByVal DateTimePicker1 As String, ByVal Position As Integer, ByVal Saturation As String, ByVal StaffTpye As String, ByVal SubSection As Integer, ByVal status As Integer, ByVal phone As String, ByVal OwnTimes As Integer)
        Dim dt As DataTable
        Dim dr As DataRow
        Dim da As New OleDbDataAdapter

        Connect()
        Dim ds As New DataSet
        dt = ds.Tables("Employer")
       

                dr = dt.NewRow()      '<----------------------------


        dr("CVNo") = CVNo
        dr("OwnTimes") = OwnTimes
        dr("ArrivalDate") = DateTimePicker1
        dr("StaffType") = StaffTpye
        dr("Emp_Saturation") = Saturation
        dr("Emp_FirstName") = FirstName
        dr("Emp_LastName") = Lastname
        dr("Emp_Position") = Position
        dr("Emp_SubSection") = SubSection
        dr("EmpContactPhone") = phone
        dr("Status") = status

        dt.Rows.Add(dr)           

        Dim combd As New OleDbCommandBuilder(da)
        da.Update(ds, "Employer")
        ds.AcceptChanges()
        da.Fill(ds, "Employer")


    End Sub
End Class