Numeric Captcha


A Simple CAPTCHA Control Provided with randomly generated one digit numbered addition should be done and entered to textbox This is a normal .ascx user control. just add this control in your project and register into a page as follows:
<%@ Register TagName="Captcha" TagPrefix="Controls" Src="NumCaptcha.ascx"%>

and call the control as follows :
<Controls:Captcha ID="captcha" runat="server" />

there are some following properties and events of the control
1. Message : this property will used for show message in red color like "wrong verification".
2. Decide() : this function returns bool type. that will helps to u find the the entered answer is valid or not. in submit button event that will check in if condition.
3. Refresh() : this function is used for refresh a numbers.
4. CalcMode : (New in 1.3 Version) : this Take Three Mode Values are 1, 2, 3 .
Mode 1: User Get Both Calculation Mode Addition and Subtraction Randomly.
Mode 2: User Get Calculation Mode is Addition.
Mode 3: User Get Both Calculation Mode is Subtraction.

For View Demo Please Click Here

Version 1.2 : One Bug Noted and Fixed on 05 Nov 2010

Version 1.3 : Launched On 1 December 2010.

1. New Feature Mode is Added named as CalcMode which Gives User two Mode Arithmetic’s operation in Numeric Captcha are Addition and Subtraction.
2. One Critical Bug of image url in captcha is notified and solved by using [Image Generation Engine]*
3. New [Image Generation Engine]* Introduced in this Version for high security and reliability.
4. Now Captcha Image Is Automatically Generated By [Image Generation Engine]*.
5. For this Captcha Maximum Encryption Is Provided.
6. This Captcha Hardly to break by bots attack because of its Complexity.
7. This is 10 times Secure than Both Previous Versions of Numeric Captcha.

Version 1.4 : One Bug of String with Number Validation is Noted in version 1.3 and Fixed on 02 Jul 2011

Note for Users who Currently Using Numeric Captcha 1.1 or 1.2 Versions.
This is Highly Recommended that upgrades a New Version of your Numeric Captcha in your site.
You have to just download it and Copy the New Files in your Numeric Captcha Folder.
We Recommend You to Remove All Old Files from Captcha Folder and then Copy Fresh 1.4 Version Files in that folder.

*Image Generation Engine: This Engine Technique Is Provided by Word to Image Tool.
Tool is published on http://worldcode.brinkster.net/Dot_Net_Tools/ImageGenerate.aspx


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