Create Captcha in asp.net

page Top
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 <%@ Register TagPrefix="recaptcha" Namespace="Recaptcha" Assembly="Recaptcha" %>


Design
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<recaptcha:RecaptchaControl ID="recaptchaCareerRegister" runat="server" PublicKey="6Lcl_eoSAAAAAC6g52dR66NO0r3U8HFChi9TobNC"
                            PrivateKey="6Lcl_eoSAAAAABzQRMPZjmWzL0PJjfCVCpJAoj1K"  Theme="clean" />


code page
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  recaptchaCareerRegister.Validate();
            if (!recaptchaCareerRegister.IsValid)
            {
                txtBriefDescription.Text = txtBriefDescription.Text;              
                Lblerror.Text = "Invalid Captcha Value. Try Again..";
                Lblerror.Visible = true;
            }
            else
            {

            }