Javascript online beautifier

http://jsbeautifier.org/

JQuery Hello world plugin

<div class="Test">
Hello world</div>
<script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.5.js" type="text/javascript">
</script>
<script type="text/javascript">
    (function($)
    {
        $.fn.helloworld = function()
        {
            return this.each(function()
            {
                $('div').css('color', 'red');
                alert('Hello world');
            });
        };
    })(jQuery);
    $('.Test').mouseover(function()
    {
        $('.Test').helloworld();
    });
</script>

Reference:

http://docs.jquery.com/Plugins/Authoring

How to check if string is number in C#

        double Num;

bool isNum = double.TryParse(Str, out Num);

if (isNum)


http://rayaspnet.blogspot.com/2011/08/how-to-check-string-is-in-valid-number.html