What are the actual use of capcha in asp.net

Question

Hi all,
Please tell me about this

Thanks

Answer 1

Hi Rajveer,

 

http://www.codeproject.com/Articles/8751/A-CAPTCHA-Server-Control-for-ASP-NET

 

http://www.aspsnippets.com/Articles/How-to-implement-Captcha-in-ASP.Net.aspx

 

 if it help you out, please accept the ans

Answer 2

Hi Rajveer,

 

A CAPTCHA is a validation layer to recognize the type of user before sending data to the server.

There are many tools to send automated messages. If you have not implemented a CAPTCHA in your feedback or user registration page then you will get many spam messages or users.

So the main advantages of CAPTCHA is to avoid spam messages or users.

 

http://www.c-sharpcorner.com/UploadFile/bd8b0b/how-to-implement-captcha-in-Asp-Net-mvc/

 

if it help you out, please accept the ans

Answer 3

CAPTCHA stands for “Completely Automated Public Turing test to tell Computers and Humans Apart”. CAPTCHA is defined as a program that can tell whether its user is a human or a computer. You’ve probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHA are used by many websites to prevent abuse from “bots,” or automated programs or Scripts usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHA.

 

It is mainly used to validate it is a human or a computer. Suppose there a employee form and it contains 10-15 fields. One user come and submit data and see what is behind the code. Just the code and execute it againand again. Means it is inserting a new record each time. Here plays a vital role. Captcha will validate the user is manually doing or executing program. Because each captcha value changes. 

 

http://blog.dictionary.com/captcha/ 

 

http://www.aspsnippets.com/Articles/How-to-implement-Captcha-in-ASP.Net.aspx

 

http://www.codeproject.com/Articles/169371/Captcha-Image-using-C-in-ASP-NET