How to set recaptcha key settings at runtime

Try using the value of setincodebehind in your tag, like this:

<recaptcha:RecaptchaControl ID="myRecaptcha" runat="server"   PublicKey="setincodebehind" PrivateKey="setincodebehind" ... />

That should let you set the keys in the codebehind properly. There are a couple of other ways to do it as well. For example, you can get the values from a static class like this:

<recaptcha:RecaptchaControl ID="myRecaptcha" runat="server"   PublicKey="<%= RecaptchaSettings.PublicKey %>"   PrivateKey="<%= RecaptchaSettings.PrivateKey %>" ... />

Where RecaptchaSettings is a class you provide. Or, you could put the keys into an appSettings section of your web.config, and access them like this:

<recaptcha:RecaptchaControl ID="myRecaptcha" runat="server"   PublicKey="<%$appSettings:RecaptchaPublicKey %>"   PrivateKey="<%$appSettings:RecaptchaPrivateKey %>" ... />

Hope that helps.

Another way to set key values, use <appSettings> keys RecaptchaPublicKey and RecaptchaPrivateKey. These values will be used automatically unless it is overridden during control declaration (mjd79's answer, first way).

Pro: if you have multiple declaration, you only need to keep the keys in one place, DRY principle.

This behaviour can be seen through the source code, RecaptchaControl.cs, line 135-...:

public RecaptchaControl(){    this.publicKey = ConfigurationManager.AppSettings["RecaptchaPublicKey"];    this.privateKey = ConfigurationManager.AppSettings["RecaptchaPrivateKey"];    ...