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protected void ListBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        ListBox3.Items.Clear();
        SqlConnection con = new SqlConnection("Server=.;database=Login;uid=sa;pwd=179425532;");
        try
        {
            con.Open();
            string strwhere = ListBox2.SelectedValue;

            SqlDataAdapter da = new SqlDataAdapter("select * from v_ClassTwo_ClassThree where classTwoID=" + strwhere, con);
            DataSet ds = new DataSet();
            da.Fill(ds);
            ListBox3.DataSource = ds.Tables[0];
            ListBox3.DataTextField = "classThree";
            ListBox3.DataValueField = "id";
            ListBox3.DataBind();
        }
        catch (Exception ex)
        {
    &


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