How to check if an argument is not a number in Javascript

isNaN function

Evaluates an argument to determine if it is not a number.

isNaN("string") //returns true

isNaN("12") //returns false

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/isNaN

Null-coalescing operator, Double question mark( ??) in C#

        int? x = null;

        Console.WriteLine(x?? 100);

Equal:

var test = (x == null) ? x : 100;

Reference:

http://msdn.microsoft.com/en-us/library/ms173224.aspx

How to show a heavy-data gridview not in page load, to prevent freezing page?

 -          Put gridview into a Update panel

<asp:UpdatePanel ID="UpdatePanelMemberList" runat="server" UpdateMode="Conditional">

    <contenttemplate>

         <asp:GridView  runat="server"/>

    </contenttemplate>

</asp:UpdatePanel>

 -          Add a hidden field to let client side javascript to click button for showing  gridview

 <asp:HiddenField ID="H1" runat="server" />

-         
After page loaded in html trigger button click
event

    $(document).ready(function () {

        var hidenv = $("#<%=H1.ClientID %>").val();

        if (hidenv != 'show') return;

         $("#<%=Submit.ClientID %>").trigger('click');

    });

How to show progress in ASP.NET WebForms by UpdatePanel

         <script type="text/javascript">

             var prm = Sys.WebForms.PageRequestManager.getInstance();

             prm.add_initializeRequest(prm_InitializeRequest);

             prm.add_endRequest(prm_EndRequest);

            

             function prm_InitializeRequest(sender, args) {

                 var panelProg = $get('divImage');                

                 panelProg.style.display = '';

             }

             function prm_EndRequest(sender, args) {

                 var panelProg = $get('divImage');                

                 panelProg.style.display = 'none';

             }

         </script>

        <asp:UpdatePanel ID="UpdatePanel1" runat="server">

            <ContentTemplate>

                <div id="divImage" style="display:none">

                     <asp:Image ID="img1" runat="server" ImageUrl="~/images/progress.gif" />

                     Processing...

                </div>                

                <br />

                <asp:Button ID="btnInvoke" runat="server" Text="Click"

                    onclick="btnInvoke_Click" />

            </ContentTemplate>

        </asp:UpdatePanel>

SCRUM, one of agile methodologies

Keyword: iterative, incremental
Reference:
http://en.wikipedia.org/wiki/Scrum_%28development%29

Good code is cheap code

   Plan your code to be cheap:

• Use patterns where they are going to be beneficial and will save you time;
• Ignore the patterns that will not (e.g. when was the last time you ported a system to a different DB?);
• Use frameworks where appropriate to speed up development;

Refactor when required, don’t get ahead of yourself;

http://www.geekm.ag/Archive/Good_code_is_cheap_code