ASP.NET BasePage dataset type is not defined

I'm am creating an ASP.NET 2.0 web application that uses a BasePage.aspx that is inherited by all other .aspx pages. I have designed a dataset with 3 stored procedures in it called dsBaseInfo. I declare it as a privat开发者_开发知识库e member of the class and when I go to run the application it tells me the dsBaseInfo type is not defined. I also tried just a Dataset instead of my dsBaseInfo and I get the same error, type not defined. I have tried Private dsBase as dsBaseInfo, Private dsBase as dsBaseInfo = nothing, Private dsBase as new dsBaseInfo, Private dsBase as Dataset, and so on. I even tried moving declaration to the PreInit sub and same error. I have also done the Private dsBAse as dsBaseInfo in a .aspx that inherits the BasePage and it works on that page.

Imports System
Imports System.Web.UI
Imports System.Data.SqlClient

Public Class BasePage
    Inherits System.Web.UI.Page

    Private dsBase As dsBaseInfo = Nothing    'dataset
    Private _userInfo As UserInfo

    Private Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreInit
        If User.Identity.IsAuthenticated Then
            _userInfo = New UserInfo

            If dsBase Is Nothing Then
                If Session("BaseInfo") Is Nothing Then
                    dsBase = New dsBaseInfo
                    RetrieveBaseInfo(dsBase)

                    Session("BaseInfo") = dsBase
                Else
                    dsBase = TryCast(Session("BaseInfo"), dsBaseInfo)
                End If
            End If

        End If

    End Sub

    Private Sub RetrieveBaseInfo(ByVal dsBase As dsBaseInfo)
        Using da As New dsBaseInfoTableAdapters.ssp_GetUserBaseInfoTableAdapter
            da.Fill(dsBase.ssp_GetUserBaseInfo, User.Identity.Name)
        End Using

        Dim intID As Integer = dsBase.ssp_GetUserBaseInfo.Rows(0)(dsBase.ssp_GetUserBaseInfo.IDColumn.ColumnName)

        Using da As New dsBaseInfoTableAdapters.ssp_GetCompaniesTableAdapter
            da.Fill(dsBase.ssp_GetCompanies, intID)
        End Using

        Using da As New dsBaseInfoTableAdapters.ssp_GetMasterMenuListTableAdapter
            da.Fill(dsBase.ssp_GetMasterMenuList, intID)
        End Using
    End Sub

End Class

Do both pages include Imports System.Data at the top of the file? (I don't see it in the supplied code.) DataSet is in that namespace, so you'll need to import that namespace in order to reference the class without fully-qualifying it.