How to show pop up div from server side on button click
<p>I am working on Payment page and i want to show a popup for showing message your payment is processing. so for now i am using CustomValidator and Submit Button. and i want to show this popup when Args is valid. my code is.</p>

<pre><code>&lt;asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="" OnServerValidate="CustomValidator1_ServerValidate"
                                            EnableClientScript="true" ValidationGroup="Authorize"&gt;&lt;/asp:CustomValidator&gt;

&lt;asp:Button ID="SubmitButton" runat="server" Text="Pay now" CausesValidation="true" CssClass="blue paynow" style="width:200px;"
                                                ValidationGroup="Authorize" OnClick="SubmitButton_Click" OnClientClick="validate(ContentPlaceHolder1_chk_agree);" /&gt;
</code></pre>
