If you have used BASIC or Pascal or C before you got here, that's OK. There will be more on that subject in the next lesson. If you need a good book to follow along with the tutorials, the Profsr recommends the author: Evangelos Petroutsos.If you did learn one of those languages, you were working in a procedural fashion: when you type RUN the program starts at the beginning and basically follows the instructions going down the list, skipping here and there according to control instructions until it finds some kind of END statement. However, you do have to write Visual basic 6 code to program the events - there are loops and conditions and arrays. His books, on all versions of VB, are among the best.

Before proceeding with the topic first we must understand "What is a Captcha code?

Most web sites have a Captcha validation in their sites. A Captcha code is simply a combination of some characters and numbers like "Alk13" or "a Tu2e P" etc. We use them for validating that the client browser window really has a human typing into it.

It does not, however, prevent the user from pasting non-numeric text into the box. It’s problematic to validate and correct user input as they are entering it.

For example, if you set the Max Value to 100, then every time you enter 1000, it jumps to 100, it can be jarring.

For example, I have absolutely no idea how a cricket game is played!

In my defense, picture to yourself, if you can, that as I write this I see outside my window that there is a metre of fresh snow on the ground and the temperature is a windy -12 However, as a French-Canadian I do have a few things in common with you in that I am not an American either and I too have to get by with English as a second language.

Thankfully, WPF supports generic text input handling so you don’t have to concern yourself with the specific hardware.

This prevents anything except numbers from being entered, whether via character recognition or keyboard.

When WPF first shipped, there was a noticeable lack of certain controls we’ve become used to in Win32 and Win Forms: Calendar, Date Time Picker, and Numeric Up Down.

WPF 4 adds Calendar and Date Picker, but not anything for numeric entry.

My statistics tell me that on the other side of the world from here (here being Canada) students and programmers in technical colleges and software training centres are studying my courses and that makes me glad. Now, I just want to apologize that the tone of most of the references and lessons is so North-American.