AppDev: Something You Should Know by Irena Kennedy

If you have multiple UpdatePanel controls on a page, and your Page_Load has a lot of data retrieval and rendering logic, you may want to know exactly which UpdatePanel is being updated, and execute only relevant code segments to optimize performance....

Each letter stands for a 1-digit number. No two letters may stand for the same number. Using pen and paper (i.e. not writing a computer program), find a value for each letter from the following set: 0, 1, 2, 3, 4, 6, 7, 8, 9. BAD + LET --...

If you’re creating a custom client-side control by deriving from System.Web.UI.IScriptControl, you may want to embed the .js files into your assembly instead of having to deploy them to every web site that uses those controls (this is especially valuable...

Q: In England, what’s the difference between a vest and a waistcoat? A: An English vest is what Americans call an undershirt; a waistcoat is what Americans call a vest. And I thought ‘football’ is the only word with different meaning in US...

More and more web sites are using rounded corners on spans (labels) and panels. And since AjaxControlToolkit makes it sinfully easy to do, before I start using it extensively, I decided to do some profiling to see the cost of that extender. Here...

Each letter stands for a 1-digit number. No two letters may stand for the same number. Find a value for each letter from the following set: 0, 1, 4, 5, 6, 7, 8, 9. ASK + GAVE ------- USED Answer is here . Source: http://www...

Can you think of a case where you’d like to remove more than one character from a string? Some examples include '\r' and '\n' as a carriage return + line feed, or '$', ',' and ' ' for currency data entry fields… Of course you could call string.Replace...

I created an application that allows you to calculate and compare the future estate value given two scenarios: Sell a house and reinvest the proceeds at a fixed percentage for specified number of years and re-investing earned interest Keep the...

In my post SYSK 315 ( http://blogs.msdn.com/irenak/archive/2007/03/27/sysk-315-generic-functions-for-object-xml-serialization-deserialization.aspx ) I shared two generic functions for serialization and de-serialization of any object to/from xml. ...

Note : If you know of the source or author, please let me know so I can give proper credit. Special thanks to Gabe Brown for forwarding this image.

The other day I came across the following article by Eric Meyer -- http://meyerweb.com/eric/css/edge/popups/demo.html . Basically, instead of using JavaScript, you use CSS to change an element style that results in some other element(s) appearing...

Microsoft.VisualBasic.dll exposes a number of very useful financial functions, but, as far as I can see, there are no such functions in C#. Of course one can simply reference Microsoft.VisualBasic assembly, especially since it is relatively light...

Yesterday’s post described three ways to extend an existing type. It occurred to me that there is one more, slightly different mechanism, for defining a prototype function… you can think of it as Method 2-b. Consider the following: function...

It’s true -- Carausius morosus, also known as the 'common', 'Indian' or 'laboratory' stick insect, are all female and reproduce by parthenogenesis, i.e. without mating. The eggs laid by the females hatch without being fertilized by males. As the...

Recently, I have learned about a product called LinkScanner from Exploit Prevention Labs. You can use it in two ways to be advised in advance (i.e. before you click on a link) if the site you’re about to visit is known for having exploits, hacked pages...

If you subtract a three digit number (all digits unique) from another three digit number whose digits are reverse of the first number, you end up with another three digit number consisting of same digits, but in a different order: xyz – zyx = zxy...

Say, you’ve added a few extender controls to make your AJAX-enabled web site look very ecstatically appealing to the end users. And now you’d like to evaluate the cost of beautifying your site in such manner. Measuring the additional page size bytes is...

Supermarkets and pharmacies offer discounts when you sign up for their loyalty cards. But every time you swipe your card, you purchases are recorded for marketing purposes. These buying records are now being sold to life and health insurance companies...

Answer: Either by gulping air into their stomach and intestines and floating across, or by sinking to the bottom of shallow water and using their claws to walk across. They can hold their breath for about six minutes. Source: The 365 amazing...

Not going to MIX 07 this year? You can still download a number of videos, PowerPoint slides, scripted demons and hands-on labs on a variety of web development topics at http://visitmix.com/university/ .

A cross between a zebra and a horse. Here is a quote from http://www.geocities.com/zedonknzorse/basics.html : “Zebras, donkeys, and horses are all members of the family equus - Equines. They are all slightly different in genetic makeup...

That’s easy -- just run the SQL statement below… select session_id , request_id , start_time , status , cpu_time , er . total_elapsed_time , substring ( st . text , ( er . statement_start_offset / 2 ) + 1 , (( case er . statement_end_offset...

Apparently… yes! W. H. Thorpe (University of Cambridge) was the first to demonstrate learning in birds by performing what is now considered to be a classic experiment, involving the isolation of male chaffinches (European songbirds) in soundproof...

Ever wonder what are the circumstances of when Windows blue screens? To my knowledge, if an unhandled exception occurs in kernel-mode code (e.g. a privileged device driver or the OS kernel itself), Windows considers it too unsafe to keep running, so it...

Consider the following scenario – you create your own calendar control and you’d like to raise an event when a date is selected (e.g. OnDateClicked)… and you’d like for the users of your calendar control to process the event using JavaScript on the client...