当DataSourse发生变化时，SQL LINQ to Datatable不会刷新

Question

以下是代码填充GridLookUpEdit（Dev Express）或来自LINQ的任何组合。 问题是，当基础数据源发生变化时，它不会刷新

    Dim l_LNQUserAccess = (From TBU_User In PB_DT_User
                            Join TBU_AccessLevel In PB_DT_AccessLevel
                            On TBU_User.Field(Of Guid)("AccessLevelDID") Equals TBU_AccessLevel.Field(Of Guid)("PKGUID")
                            Where (TBU_User.Field(Of Integer)("BranchID") = Pb_ST_BranchInf.LoginBranchId) And (TBU_User.Field(Of Integer)("Operation") <> PB_EN_DBOpp.Delete)
    Select New With
        {
            .PKGUID = TBU_User.Field(Of Guid)("PKGUID"),
            .UserID = TBU_User.Field(Of String)("UserID"),
            .Descr = TBU_User.Field(Of String)("Descr"),
            .AccessLevelID = TBU_AccessLevel.Field(Of String)("AccessLevelID")
        })

    Dim bs = New BindingSource()
    bs.DataSource = l_LNQUserAccess


    l_GLE.Properties.ValueMember = "PKGUID"
    l_GLE.Properties.DisplayMember = "UserID"
    l_GLE.Properties.DataSource = ""
    l_GLE.Properties.DataSource = bs