Problem loading bootsrap modal on asp button click

I've been trying to come up with a way to use asp validation controls, but also come up with a confirm yes or no modal when the user clicks the submit button.

So the user clicks submit button validation controls validate, and then this is what I am trying to run.  I've tried it both ways.

    Private Sub btnConfirm_Click(sender As Object, e As EventArgs) Handles btnConfirm.Click
        ' ClientScript.RegisterClientScriptBlock(Me.GetType(), "ClientScript", "$('#ConfirmModal').modal('show');", True)
        ScriptManager.RegisterClientScriptBlock(Me, Me.GetType(), "Confirm", "$('#confirmModal').modal('show'); ", True)

    End Sub

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HTML

<div class="modal fade" id="ConfirmModal" tabindex="-1" role="dialog" aria-labelledby="basicModal" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <h4 class="modal-title" id="myModalTitle">Payment Confirmation</h4>
                </div>
                <div class="modal-body">
                    <div class="row">
                        <div class="col-md-12">
                            Are you Sure ?
                        </div>
                        <br />
                        <div class="row">
                           <div class="col-md-12">
                               <asp:Button runat="server" ID="btnChk" CssClass="ui-button" Text="Yes" />
                               <asp:Button runat="server" ID="btnCancel"  CssClass="ui-button" Text="No" />

                           </div>
                        </div>
                    </div>
                </div>
            </div>


        </div>



        </div>

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What is the best way to handle this.  I know I can build a confirm page, but that doesnt seem like the as (Nice??)