jQuery Sweet Alert delete confirmation example in ASP.Net

ahmadsubuhanlubis says:

Public Shared Function DeleteClick(ByVal id As Integer) As String

WebMethod accepting parameter id.

But you are not passing from Ajax.

Refer below example.

HTML

<asp:ScriptManager ID="ScriptManager" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel" runat="server">
    <ContentTemplate>
        <asp:Button ID="btnSweetAlert" runat="server" Text="Delete" OnClientClick="return functionConfirm();" />
    </ContentTemplate>
</asp:UpdatePanel>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/limonte-sweetalert2/5.0.7/sweetalert2.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/limonte-sweetalert2/5.0.7/sweetalert2.min.css" rel="stylesheet" type="text/css" />
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
    function functionConfirm(event) {
        swal({
            title: 'Are you sure?',
            text: "You won't be able to revert this!",
            type: 'warning',
            showCancelButton: true,
            confirmButtonColor: '#3085d6',
            cancelButtonColor: '#d33',
            confirmButtonText: 'Yes, delete it!',
            cancelButtonText: 'No, cancel!',
            confirmButtonClass: 'btn btn-success',
            cancelButtonClass: 'btn btn-danger',
            buttonsStyling: false
        }).then(function (result) {
            if (result) {
                var id = 1;
                $.ajax({
                    type: "POST",
                    url: "Default.aspx/DeleteClick",
                    data: '{id:' + id + '}',
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (r) {
                        swal("Data Transfered SuccessFully", r.d, "success");
                    }
                });
            }
        }, function (dismiss) {
            if (dismiss == 'cancel') {
                swal('Cancelled', 'Your imaginary file is safe :)', 'error')
            }
        });
    }
</script>

Code

<System.Web.Services.WebMethod()>
Public Shared Function DeleteClick(ByVal id As Integer) As String
    Return "Hello"
End Function

Screenshot