ASP.NET

<asp:panel id="AddDeviceModalPanel" style="display: none" runat="server">
    <div class="HellowWorldPopup">
        <div class="PopupHeader" id="PopupHeader"><asp:label runat="server" ID="ppheader" Text="Add a device" /></div>
        <div class="PopupBody">
            <asp:Label runat="server" ID="ppid" Visible="false" />
            <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <ContentTemplate>
                    <script type="text/javascript">
                        Sys.Application.add_load(BindEvents);
                    </script>
                    <table id="NewDeviceTable" runat="server">
                        <tr id="ipv4row"  runat="server">
                            <td><asp:label id="ipv4lbl" runat="server" Text="IPv4" /></td>
                            <td>
                                <asp:ListBox ID="ipv4multiselection" runat="server" SelectionMode="Multiple" />
                            </td>
                        </tr>
                    </table>
                </ContentTemplate>
            </asp:UpdatePanel>
        </div>
        <div class="center">
            <asp:button runat="server" id="AddDevicebtnSave" text="Save" />
            <asp:button runat="server" id="AddDevicebtnCancel" text="Cancel" />
        </div>
        <div>
            <asp:Label runat="server" ID="ppstatus" ForeColor="Red" />
        </div>
    </div>
</asp:panel>
<asp:HiddenField ID="hidForAddDeviceModel" runat="server" />
<ajaxToolkit:ModalPopupExtender ID="add_device_popup" runat="server" TargetControlID="hidForAddDeviceModel" PopupControlID="AddDeviceModalPanel" BackgroundCssClass="ModalPopupBG" />

<script type="text/javascript">
    function BindEvents() {
        var orderCount = 0;
        $('[id*=ipv4multiselection]').multiselect({
            includeSelectAllOption: false,
            maxHeight: 200,
            numberDisplayed: 2,
            onChange: function (option, checked) {
                if (checked) {
                    orderCount++;
                    $(option).data('order', orderCount);
                }
                else {
                    $(option).data('order', '');
                }
            },
            buttonText: function (options) {
                if (options.length === 0) {
                    return 'None selected';
                }
                else if (options.length > 3) {
                    return options.length + ' selected';
                }
                else {
                    var selected = [];
                    options.each(function () {
                        selected.push([$(this).text(), $(this).data('order')]);
                    });

                    selected.sort(function (a, b) {
                        return a[1] - b[1];
                    });

                    var text = '';
                    for (var i = 0; i < selected.length; i++) {
                        text += selected[i][0] + ', ';
                    }

                    return text.substr(0, text.length - 2);
                }
            },

            onDropdownHidden: function (event) {
                var selected = [];
                $('[id*=ipv4multiselection] option:selected').each(function () {
                    selected.push([$(this).val(), $(this).data('order')]);
                });

                selected.sort(function (a, b) {
                    return a[1] - b[1];
                });

                var text = '';
                for (var i = 0; i < selected.length; i++) {
                    text += selected[i][0] + ', ';
                }
                text = text.substring(0, text.length - 2);

                alert(text);
            }
        });
    }
</script>

             text = text.substring(0, text.length - 2);

   document.getElementById("Label1").innerHTML = text;
    alert(text);
}
    });
}

            text = text.substring(0, text.length - 2);

            ipv4sesssionvar(text);
            
            alert(text);
        }
    });
}

<System.Web.Services.WebMethod()> Public Function ipv4sesssionvar(ByVal txt As String) As String
    Session("ipv4") = txt
    ipv4sesssionvar = txt
End Function

            text = text.substring(0, text.length - 2);

            ipv4sesssionvar(text);
        }
    });
}

function ipv4sesssionvar(text) {
    PageMethods.ipv4sesssionvar(text, OnComplete);
    return false;
}

function OnComplete(result) {
    alert(result);
}

private void FirstFillDatalist()
{
    adapter = new SqlDataAdapter("select * from category", con);       
    adapter.Fill(set);
    DataList1.DataSource = set;
    DataList1.DataBind();
}

     <asp:DataList ID="DataList1" runat="server" RepeatColumns="3" Width="150px"
 DataKeyField="sub_category" >
<ItemTemplate>

static public string ValidateCredentials(string userName, string password)
        {
            string result = null;
            try
            {
                log4net.ILog log = log4net.LogManager.GetLogger("Login.Aspx");
                DateTime time0 = DateTime.Now;
                PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, StsDomainName, StsAdRootOu + "," + StsDomainDn , ContextOptions.SimpleBind,StsAdUserName, StsAdUserPswd);
                
                
                if (principalContext.ValidateCredentials(StsDomainShrotName +"\\" + userName, password,ContextOptions.SimpleBind))
                    result = "1";
                else
                    result = "0";
                log.Debug("Time cost：" + (DateTime.Now - time0).TotalMilliseconds + "DC：" + principalContext.ConnectedServer);
                //principalContext.Dispose();
            }
            catch (Exception e)
            {
                result = e.Message;
            }
            
            return result;