Implement Paging in ListView Control using DataPager in ASP.Net

Hello sir,

i am applying paging in list view. i used data pager control. but problem is on click of next page next data is not displaying only showing previous data.

i have one dropdown i am bing list view on dropdownindex change event not in page load.

plz advise me how will i do this. sharing my code.

 <div id='main-content' style="overflow: auto; width: 100%" class="printable">
        <asp:ListView ID="LSVAllSlips" runat="server" GroupItemCount="2" GroupPlaceholderID="groupPlaceholder1"
            ItemPlaceholderID="itemPlaceholder1" OnPagePropertiesChanged="LSVAllSlips_PagePropertiesChanged">
            <LayoutTemplate>
                <table>
                    <tr id="Tr1" runat="server">
                        <td colspan="6" style="height: 2mm">
                        </td>
                    </tr>
                    <tr id="groupPlaceholder1" runat="server" align="center">
                    </tr>
                </table>
            </LayoutTemplate>
            <GroupTemplate>
                <tr>
                    <td id="itemPlaceholder1" runat="server">
                    </td>
                </tr>
            </GroupTemplate>
            <ItemTemplate>
                <td>
                    <div class="textRotate">
                        <asp:Image ID="imgUrl" runat="server" ImageUrl='<%# Eval("Image")%>' Height="10mm" /></div>
                    <%--  <asp:Label ID="lblmemid" runat="server" Text='<%# Eval("MemberShipid") %>' Font-Bold="True"--%>
                    <%--Font-Size="Larger" />--%>
                </td>
                <td align="left" style="width: 8.5cm; height: 32.15mm; background: #dedede;">
                    <asp:Label ID="lblname" runat="server" Text='<%# Eval("Name") %>' Font-Size="12px"
                        Font-Bold="true" /><br />
                    <asp:Label ID="lbladd" runat="server" Text='<%# Eval("Address") %>' Font-Size="12px" /><br />
                    <asp:Label ID="lblcity" runat="server" Text='<%# Eval("City") %>' Font-Size="12px" />,
                    <asp:Label ID="lblstate" runat="server" Text='<%# Eval("State") %>' Font-Size="12px" />
                    -
                    <asp:Label ID="lblpin" runat="server" Text='<%# Eval("Pincode") %>' Font-Size="12px" /><br />
                    <asp:Label ID="lblcountry" runat="server" Text='<%# Eval("Country") %>' Font-Size="12px" /><br />
                    Mob:
                    <asp:Label ID="lblmo" runat="server" Text='<%# Eval("Mobile1") %>' Font-Size="12px" />&nbsp
                    Ph:&nbsp
                    <asp:Label ID="lblph" runat="server" Text='<%# Eval("Phone1") %>' Font-Size="12px" />
                </td>
                <td style="width: 5mm;">
                </td>
            </ItemTemplate>
            <GroupSeparatorTemplate>
                <tr id="Tr1" runat="server">
                    <td colspan="6" style="height: 2mm">
                    </td>
                </tr>
            </GroupSeparatorTemplate>
        </asp:ListView>
        <asp:DataPager ID="printlistpaging" runat="server" PagedControlID="LSVAllSlips" PageSize="16">
            <Fields>
                <asp:NextPreviousPagerField ShowNextPageButton="False" ButtonCssClass="previousNextLink" />
                <asp:NumericPagerField ButtonCount="10" ButtonType="Link" NumericButtonCssClass="numericLink" />
                <asp:NextPreviousPagerField ShowPreviousPageButton="False" ButtonCssClass="previousNextLink" />
            </Fields>
        </asp:DataPager>
    </div>

 cs code

protected void DDLprint_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (DDLprint.SelectedIndex == 0)
        {
            LSVAllSlips.DataSource = "";
            LSVAllSlips.DataBind();
        }
        else if (DDLprint.SelectedIndex == 1)
        {
            AllSlips();
        }
        else if (DDLprint.SelectedIndex == 2)
        {
            ValidSlips();
        }
        else if (DDLprint.SelectedIndex == 3)
        {
            CorrectedSlips();
        }
    }