Finding Captcha control inside createuserwizard

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C#

ASP.NET

I am integrating a Captcha control inside a CreateUserWizard.

As I wanted to do a validation for user's input based on the Captcha using an if.. else.. statement. However an error occured when I trying to get the Captcha control from the createuserwizard.

Here the is error :

The name 'Captcha1' does not exist in the current context

I had tried to get this control as a textbox, image, control but it was not successful.

Here is the code :

<asp:CreateUserWizardStep ID="CreateUserWizardStep1" runat="server">
<ContentTemplate>

<tr>
<td class="style4">Answer:</td>
<td>


<cc1:CaptchaControl ID="Captcha1" runat="server"
CaptchaBackgroundNoise="Medium"
CaptchaLength="5"
CaptchaHeight="55"
CaptchaWidth="200"
CaptchaLineNoise="None"
CaptchaMinTimeout="5"
CaptchaMaxTimeout="240" 
FontColor = "#FF33CC"
CaptchaFontWarping="Medium" />

<asp:TextBox runat="server" ID="txtCaptcha" />

</td>
</tr>
</ContentTemplate>

</asp:CreateUserWizardStep>

Here is the code at the behind :

protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e)
    {
        //Control Captcha1 = (Control)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Captcha1");
        TextBox txtCaptcha = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("txtCaptcha");

            Captcha1.ValidateCaptcha(txtCaptcha.Text.Trim());//error occurred here

        if (Captcha1.UserValidated)//error occurred here
        {

     }

}