Captcha Control in DotNetNuke/DNN Module
I need to add Captcha Control for couple of contact and submission forms to stop
possible spam bots. I tried with the similar way I approched In previous website
application developed in ASP.NET. But, Its even too easy to add Captcha capability
in forms than we do for simple websites. DotNetNuke/DNN is having a built in Captcha
control which can be used on contact and submission forms.
First you need to add register tag for the control on your module user control.
This will allow to create Captcha control and use it in code. The register line
goes as:
<%@
Register TagPrefix="dnn"
Assembly="DotNetNuke"
Namespace="DotNetNuke.UI.WebControls"%>
Next, is you need to create the control in ascx page as:
<dnn:CaptchaControl runat="server"
ID="dnnCaptchaControl"
ErrorStyle-CssClass="NormalRed"
cssclass="Normal"
ErrorMessage="The
typed code must match the image, please try again"
CaptchaHeight="35"
CaptchaWidth="120"
/>
Believe
me, you are done with DNN Captcha control! You only need to validate whether the
entered value for captcha by user is correct or not. You can write below code in
contact/sybmission form's submit button click event:
if(ctlCaptcha.IsValid)
{
//Captcha is valid! Code to submit
the contact/submission form...
}
else
return;