<asp:Button ID="btnHiddenSearch" runat="Server" Style="display:none" />


                    <ajaxtoolkit:modalpopupextender id="mpeSearch" runat="server" backgroundcssclass="modalBackground" popupcontrolid="pnlSearch" targetcontrolid="btnHiddenSearch"></ajaxtoolkit:modalpopupextender>

                    <asp:Panel ID="pnlSearch" runat="server" CssClass="modalBox" Style="display:none;" Width="500px">
                        <asp:Panel ID="pnlSearchCaption" runat="server" CssClass="caption" Style="margin-bottom: 10px; cursor: hand;">
                            Search
                        </asp:Panel>
                       <div class="divCol">
                            Last Name</div>
                        <div class="divColLast">
                            <asp:TextBox ID="txtLName" runat="server"></asp:TextBox>
                        </div>
                        <div class="clearer">
                        </div>
                        <div class="divCol">
                            First Name</div>
                        <div class="divColLast">
                            <asp:TextBox ID="txtFName" runat="server"></asp:TextBox>
                        </div>
                        <div class="clearer">
                        </div>
                        <div class="divCenter">
                            <asp:Button ID="btnFind" runat="server" Text="Search" UseSubmitBehavior="false" onClientClick = "this.disabled=true; this.value = 'Searching...';" OnClick = "btnFind_Click"/> &nbsp; <asp:Button ID = "btnSearchCancel" runat = "server" Text = "Cancel" OnClick = "btnSearchCancel_Click" />
                        </div>
                        <div class = "divCenter">
                            <asp:DataGrid Width = "75%" ID="dgv" runat="server" AutoGenerateColumns="false" PagerStyle-HorizontalAlign="center" PagerStyle-PrevPageText="Prev" OnPageIndexChanged="dgv_Paging" PagerStyle-NextPageText="Next"  AllowPaging="True" AllowSorting="True" OnItemCommand="ReportSession"  CssClass="Header">
                               <Columns>
                                     <asp:ButtonColumn DataTextField="Name" ItemStyle-Width="30%" HeaderText="Name" HeaderStyle-HorizontalAlign="center" ItemStyle-VerticalAlign="middle" CommandName="SetSession" ></asp:ButtonColumn>
                               </Columns>
                           </asp:DataGrid><asp:Label ID="lblPages" runat="server" Visible="False"/>
                           <br />
                           <asp:Label ID="lblMsg" runat="server" Font-Bold="True" Font-Size="Larger" Text="No Students Found.  Please Search Again." Visible="False"/>

                        </div>
                    </asp:Panel>

    public void ibtnSearch_Click(object sender, EventArgs e)
    {
        upFilter.Update();
        mpeSearch.Show();
    }