jQuery Toast Notification 

 <link media="screen" rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/toastr.js/latest/css/toastr.css" />

    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.0.1/js/toastr.js"></script>

var toastrOptions = {

            "closeButton": true,

            "debug": false,

            "newestOnTop": false,

            "progressBar": true,

            "positionClass": "toast-top-right",

            "preventDuplicates": true,

            "onclick": null,

            "showDuration": "300",

            "hideDuration": "1000",

            "timeOut": "12000",

            "extendedTimeOut": "1000",

            "showEasing": "swing",

            "hideEasing": "linear",

            "showMethod": "fadeIn",

            "hideMethod": "fadeOut"

        };


        function showNotification(msg, title) {

            toastr.options = toastrOptions;

            toastr.success(msg, title);

            return false;

        }


        function showError(msg, title) {

            toastr.options = toastrOptions;

            toastr.error(msg, title);

            return false;

        }


C#

 objectname.ShowMessageError(this, "Please Select Route Name");



Sub ShowMessageError(ByVal Page As Page, ByVal Message As String)

        Page.ClientScript.RegisterStartupScript(Me.GetType(), "Error", "<script>showError('" & Message & "', 'Error')</script>")

    End Sub

    Sub ShowMessageSuccess(ByVal Page As Page, ByVal Message As String)

        Page.ClientScript.RegisterStartupScript(Me.GetType(), "Success", "<script>showNotification('" & Message & "', 'Success')</script>")

    End Sub