ini aspx page ane : 

<asp:ListView ID="ListViewHRDFormIzin" runat="server" DataSourceID="SqlDataStaffHRDFormIzin" DataKeyNames="STAFF_NIK" EnableViewState="false">

    <LayoutTemplate>

        <table id="dataTable" class="table table-bordered striped data" align="left">

            <thead style="background-color: #4877CF">

                <!-- add checkbox -->

                <th style="text-align: center; color: white">Check</th>

                <th style="text-align: center; color: white">NIK</th>

            </thead>

            <asp:PlaceHolder ID="itemPlaceHolder" runat="server" />

        </table>

    </LayoutTemplate>

    <ItemTemplate>

        <tr>

            <td>

                <asp:CheckBox ID="CheckBox1" runat="server" />

            </td>

            <td style="text-align: center">

                <asp:Label ID="lbl" runat="server" Text='<%# Eval("STAFF_NIK")%>'></asp:Label></td>

            <td style="text-align: center">

                <asp:LinkButton ID="lnkSelect" Text='DETAIL' CommandName="Select" runat="server"><img src="img/detail.png" width="50px" height="50px" /></asp:LinkButton></td>

        </tr>

    </ItemTemplate>

    <EmptyDataTemplate>Data Izin Karyawan Tidak diketemukan</EmptyDataTemplate>

    <EmptyItemTemplate>Data Izin Karyawan Tidak diketemukan</EmptyItemTemplate>

</asp:ListView>



<asp:Button ID="Button1" Visible="true" runat="server"

    Text="Get Data" class="btn btn-success" />

ini vb class ane : 

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click



    'get data from chekced checkbox

    Dim ChkValue As New List(Of String)()

    For Each item As ListViewItem In ListViewHRDFormIzin.Items

        Dim ck As CheckBox = DirectCast(item.FindControl("CheckBox1"), CheckBox)

        If ck.Checked Then

            ChkValue.Add(DirectCast(item.FindControl("lbl"), Label).Text)

        End If

    Next

    For Each itms As String In ChkValue

        Response.Write("[script]alert('Value Selected: " + itms + "')[/script]")

    Next



    Response.Write("[script][removed].href='HRDFORMIZIN.aspx';[/script]")



End Sub

NB : Ane gatau kenapa jadi [remove] tampilan di kaskus , padahal ane ketiknya script tag bukan remove

Beberapa suggestion udah ane coba tapi tetep aja ane gak dapet nilai row yg di check . suggestion nya seperti berikut : 
ane taro do page_load:

If IsPostBack = False Then

    ListViewHRDFormIzin.DataBind()

End If

atau set properti listview nya menjadi : 
EnableViewState="false"

kira kira apa ya yg ane lewatin? kenapa pas postback data nya gak ke kirim ketika button1 di click? mungkin agan agan ada yg pernah ngalamin hal serupa masalah checkbox di listview asp?