How to make math captcha in

In spare time, make captcha in math style using C# – ASP.Net. First thing first, create the database. Then show the captcha randomly. I know it’s unsecure this way. Better replace the captcha with image.


  <asp:Label ID="capcay" runat="server" Text="Label"></asp:Label>
    <asp:HiddenField ID="hd_capcay" runat="server" />
    <asp:TextBox ID="a_capcay" runat="server"></asp:TextBox>
     <asp:Button ID="Button4" runat="server" onclick="Button4_Click" Text="Button" />
     <asp:Label ID="validd" runat="server" Text="Label"></asp:Label>
     <asp:Label ID="dump" runat="server" Text="Label" Visible="false"></asp:Label>


 private RetnoTest.Library.Master.Test msc = new Library.Master.Test();
        private DbDataReader MyRead;
        protected void Page_Load(object sender, EventArgs e)
            dump.Text = hd_capcay.Value;
  protected void retrieve_capcay()
            MyRead = msc.Capcay_browse();
            hd_capcay.Value = MyRead[0].ToString();
            capcay.Text = MyRead[1].ToString();
        protected void jawab_capcay() {            
            MyRead = msc.jawab_capcay(dump.Text, a_capcay.Text);
            if (MyRead.HasRows)
                    validd.Text = "benar!";
            else {
                validd.Text = "salah. itung lagi";
            a_capcay.Text = "";
        protected void Button4_Click(object sender, EventArgs e)


   public DbDataReader Capcay_browse()
            strSQL = "SELECT TOP 1 * FROM MC_Capcay order by newid()"; // menampilkan data di SQLServer secara acak
            return Helper.ExecuteReader(strSQL);
        public DbDataReader jawab_capcay(string id, string jawab)
            strSQL = "SELECT * FROM MC_Capcay WHERE id = '" + id + "' and jawaban = '"+ jawab +"'";
            return Helper.ExecuteReader(strSQL);

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s