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A-Programmer/GoogleReCaptchaV2.txt

Last active August 23, 2023 04:52
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How to use reCaptcha v2 in ASP.NET
Raw
GoogleReCaptchaV2.txt
(Another way : https://github.com/tanveery/recaptcha-net)
1. Get secret key and site key from : https://www.google.com/recaptcha/admin
2. Add them to web config :
<add key="recaptcha-secret-key" value="...[secret key]" />
<add key="recaptcha-public-key" value="...[public-key]" />
3. Install Package :
PM > Install-Package ReCaptcha-AspNet
4. Optional :
You can change language in web.config : (https://developers.google.com/recaptcha/docs/language)
<add key="recaptcha-language-key" value="[language-code]" />
Or via C# code :
string publicKey = "...[public-key]";
string secretKey = "...[secret-key]";
ReCaptcha.Configure(publicKey, secretKey);
// Optional, select a default language:
string publicKey = "...[public-key]";
string secretKey = "...[secret-key]";
ReCaptchaLanguage defaultLanguage = ReCaptchaLanguage.German;
ReCaptcha.Configure(publicKey, secretKey, defaultLanguage);
5. Add this line in <head> tag :
<script src='https://www.google.com/recaptcha/api.js'></script>
6. and this line (given by google) in bottom of your form :
<div class="g-recaptcha" data-sitekey="xxxxxxxxxxxxxxxxxxxxxxxxxxxxx"></div>
7. In button click enevn write this code:
string userResponse = Request.Params["g-recaptcha-response"];
bool validCaptcha = ReCaptcha.ValidateCaptcha(userResponse);
if (validCaptcha)
{
// Real User, validated !
Response.Write("Passed");
}
else
{
// Bot Attack, non validated !
Response.Write("You are robot");
}
@neohitokiri
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In my case:

try
{
  string userResponse = Request.Params["g-recaptcha-response"];
  bool validCaptcha = ReCaptcha.ValidateCaptcha(userResponse);
  if (validCaptcha)
  {
    // Real User, validated !
    Response.Write("Passed");
  }
  else
  {
    // Bot Attack, non validated !
    Response.Write("You are robot");
  }
}
catch (Exception)
{
  Response.Write("Please complete puzzle");
}

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