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code for CheckBoxList control in asp.net

// default.aspx //

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="default.aspx.cs" Inherits="default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">
<style type="text/css">
        .PnlDesign
        {
            border: solid 1px #000000;
            height: 150px;
            width: 330px;
            overflow-y:scroll;
            background-color: #EAEAEA;
            font-size: 15px;
            font-family: Arial;
        }
        </style>
        </style>
</head>
<body>

    <form id="form1" runat="server">

     <asp:CheckBoxList ID="CheckBoxList1" runat="server" RepeatColumns="1"
            style="position:absolute; top: 890px; left: 10px; height: 699px; width: 257px;" 
            AutoPostBack="True" CellSpacing="1" CssClass="PnlDesign">

        </asp:CheckBoxList> 

    </form>
</body>

</html>


// default.aspx.cs //

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Drawing;

public partial class default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            FillQualCheckBoxList();
        }
}
 private void FillQualCheckBoxList()
    {
        SqlConnection con = new             SqlConnection(ConfigurationManager.ConnectionStrings["Pubs"].ConnectionString);
        SqlCommand cmd = new SqlCommand("Select * from category", con);
        SqlDataAdapter adp = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        adp.Fill(dt);
        cblCourses.DataSource = dt;
        cblCourses.DataTextField = "Name";
        cblCourses.DataValueField = "Id";
        cblCourses.DataBind();

                                
    }


// Add Code in web.config //

<connectionStrings>
<add name="Pubs" connectionString="Data Source=.;Initial Catalog=rnp;Integrated Security=True"/>
    
</connectionStrings>

// SQL Table //



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