14 Jul '15

Anupa Manipal

A professional Software Developer in VB.NET - SQL Server and learner of PHP. Expertise in implementation of various projects including designing, development, coding and implementation of software applications.

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Captcha text in VB.NET

This topics contains the example program of Captcha text in VB.NET. The CAPTHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. This will reduce the hackers, spam attackers, and fake visitors or entries from website.

Example Screenshot: In the following example we create one label to display random generated captcha text, Refresh button to change captcha text, Text box to enter captcha text for trusted users and Register button to verify the entered text valid or not.

Captcha Text in VB.NET 


Source Code :

System.Drawing.Drawing2D is the two dimensional and vector graphics functionality. The randomly generated captcha text stores in str string variable. In the button it validates txtReg text box and str variable. The random generated text stores in str variable. Maimum it stores 5 characters. The the program converts text to bit map image. Same code applied in the form load and btn referesh button.

Download Example Code:

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Video Tutorial of Captcha Text:

 

About Anupa Manipal

A professional Software Developer in VB.NET - SQL Server and learner of PHP. Expertise in implementation of various projects including designing, development, coding and implementation of software applications.

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