为什么recaptcha.IsValid总是返回True

Question

为什么recaptcha.IsValid总是返回True？

Protected Sub CreateUserWizard1_CreatingUser(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.LoginCancelEventArgs) Handles CreateUserWizard1.CreatingUser 
    Dim Captcha As RecaptchaControl = CType(CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("recaptcha1"), RecaptchaControl) 
    If Not Captcha.IsValid Then 
     e.Cancel = True 
    End If 
End Sub 

Answer 1

呼叫Captcha.Validate()前Captcha.IsValid

Protected Sub CreateUserWizard1_CreatingUser(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.LoginCancelEventArgs) Handles CreateUserWizard1.CreatingUser 
    Dim Captcha As RecaptchaControl = CType(CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("recaptcha1"), RecaptchaControl) 
    Captcha.Validate() 
    If Not Captcha.IsValid Then 
     e.Cancel = True 
    End If 
End Sub