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protected void Page_Load(object sender, EventArgs e)   
{   
    if (!IsPostBack)   
    {   
        snCode.Create();//Ê״μÓÔØÉú³ÉÐÂÑéÖ¤Âë   
    }   
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protected void btnSubmit_Click(object sender, EventArgs e)   
{   
    if (!CheckCode())   
    {   
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