How to use Checkbox and Raido Button in asp.net

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Radio_check._Default" %>





   


   

   

       

       

       

       

       
   

   

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace Radio_check
{
    public partial class _Default : System.Web.UI.Page
    {
        string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;
      

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (rb1.Checked == true )
            {
                SqlConnection con = new SqlConnection(strConnString);
                com = new SqlCommand();
                com.Connection = con;
                com.CommandType = CommandType.Text;
                com.CommandText = "insert into login values(@Dept,@Gender)";
                com.Parameters.Clear();
                com.Parameters.AddWithValue("@Dept", chk1.Text);
                com.Parameters.AddWithValue("@gender", rb1.Text);
                if (con.State == ConnectionState.Closed)
                    con.Open();
                com.ExecuteNonQuery();
                con.Close();
                lblmsg.Text = "Data entered successfully!!!";
                clear();
            }
            else
            {
                SqlConnection con = new SqlConnection(strConnString);
                com = new SqlCommand();
                com.Connection = con;
                com.CommandType = CommandType.Text;
                com.CommandText = "insert into login values(@Dept,@Gender)";
                com.Parameters.Clear();
                com.Parameters.AddWithValue("@Dept", chk1.Text);
                com.Parameters.AddWithValue("@gender", rb2.Text);
                if (con.State == ConnectionState.Closed)
                    con.Open();
                com.ExecuteNonQuery();
                con.Close();
                lblmsg.Text = "Data entered successfully!!!";
                clear();
            }
        }
        void clear()
        {
            rb1.Checked = false;
            rb2.Checked = false;
            chk1.Checked = false;
           
        }
    }
}

web or windows