public partial class _Default : System.Web.UI.Page 
{
  protected void Page_Load(object sender, EventArgs e)
  {
    if (!IsPostBack)
    {
      SnCode.Create();
    }
  }

public partial class admin_adminlogin : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    if (!IsPostBack)
    {
      SnCode.Create();
    }
  }
  protected void ImageButton6_Click(object sender, ImageClickEventArgs e)
  {
    if (SnCode.CheckSN(TextBox3.Text.Trim()))
    {
      String username = TextBox1.Text;
      String userpwd = TextBox2.Text;
      users user1 = null;
      user1 = new users();
      user1.Admin = username;
      user1.Pwd = userpwd;
      DataSet ds1 = new userschuli().adminlogin(user1);
      DataTable dt = ds1.Tables[0];
      if (dt.Rows.Count > 0)
      {
        Response.Write("<script>alert('用户名和密码正确!');</script>");
      }
     else
      {
  Response.Write("<script>alert('用户名或密码不正确!');</script>");
   }
  }
    else
    {
      Response.Write("<script>alert('验证码错误!');</script>");
    }
  }
protected void ImageButton5_Click(object sender, ImageClickEventArgs e)
  {
    TextBox1.Text = "";
    TextBox2.Text = "";
    TextBox3.Text = "";
  }
}