SQL Connection variable not in the current context - asp.net

Question

I am a beginner in.NEt and having difficulty using the sql connection in a radio button index changed eventhandler that i defined on the page_load.
Below is my code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
namespace Controls
{
public partial class Report_Selection : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
GridView1.HeaderStyle.Font.Bold = true;
RadioButtonList1.SelectedIndexChanged += new EventHandler(RadioButtonList1_SelectedIndexChanged);
using (SqlConnection cnn = new SqlConnection("Data Source=DBSW9079;Initial Catalog=Underwriting;Integrated Security=SSPI;"))
{
SqlCommand cmd;
SqlDataReader sdr;
if (!IsPostBack)
{
cmd = new SqlCommand("select Categoryid,CategoryTitle from Report_Category", cnn);
cnn.Open();
sdr = cmd.ExecuteReader();
SelectCategorydlist1.DataSource = sdr;
SelectCategorydlist1.DataTextField = "CategoryTitle";
SelectCategorydlist1.DataValueField = "categoryid";
SelectCategorydlist1.DataBind();
cnn.Close();
}
else
{
//It's a Post back
//make the grid visible and fill it
GridView1.Visible = true;
RadioButtonList1.SelectedValue = "1";
cmd = new SqlCommand("Select rptdesc,rptdesctext,categoryid from report_description " + "where categoryid != 99999"
+ "and categoryid = " + Convert.ToInt32(SelectCategorydlist1.SelectedValue).ToString(), cnn);
cnn.Open();
sdr = cmd.ExecuteReader();
GridView1.DataSource = sdr;
GridView1.DataBind();
sdr.Close();
{
}
}
}
}
void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlCommand cmd1;
SqlDataReader sdr1;
if (RadioButtonList1.SelectedIndex.Equals(1))
{
RadioButtonList1.ClearSelection();
cmd1 = new SqlCommand("Select rptdesc,rptdesctext,categoryid from report_description "
+ "and categoryid = " + Convert.ToInt32(SelectCategorydlist1.SelectedValue).ToString(), cnn);
cnn.Open();
sdr1= cmd1.ExecuteReader();
GridView1.DataSource = sdr1;
GridView1.DataBind();
sdr1.Close();
}
}
}
}
In the above code when i use the cnn sequel connection in the event handler i get an small r

Answer 1

Your query in RadioButtonList1_SelectedIndexChanged appears to be incorrect. There's an and without a where:
Select rptdesc,rptdesctext,categoryid from report_description
and categoryid = ...
^^^ should be WHERE