怎样对asp.net中VerifyCode验证码进行验证

Question

怎样对asp.net中VerifyCode验证码进行验证，谢谢！VerifyCode验证码是用session存储的。我怎样在在aspx页面的page_load中获取VerifyCode验证码，并且与页面的验证码一致

Answer 1

protected void Page_Load(object sender, EventArgs e)
{
    string VerifyCode=string.Empty;

    if(null!= Session["VerifyCode"])
    {
        Session["VerifyCode"]=null; 
        VerifyCode=Session["VerifyCode"].ToString().ToLower().Trim();


        if(txtVerifyCode.Text.ToLower().Trim()==VerifyCode)
        {
            //do...
        }
        else
        {
            //do...
        }
    }
    else
    {
        //do...
    }
}

Answer 2

protected void Page_Load(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(txtVerifyCode.Text) && Session["VerifyCode"] != null)
            {

                if (txtVerifyCode.Text.Trim().Equals(Session["VerifyCode"].ToString()))
                {
                    //do…
                }
            }
        }