DataList keep displaying previously loaded datalist

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C#

ASP.NET

I have a catalog function whereby user can filter their selection by clicking radiobutton. For example, by selecting the Dining radiobutton, all packages related to dining would appear.

And i using DataList1.Items.Count method to count the number search result. I had implement this method in the page_load, however the value of the number of datalist keep displaying previously loaded datalist.

Here is my code :

protected void Page_Load(object sender, EventArgs e)
   {
       DataList1.DataSourceID = "SqlDataSource3";
       Label1.Text = DataList1.Items.Count.ToString();
   }


   private SqlDataReader getReader()
   {
       //get connection string from web.config
       string strConnectionString = ConfigurationManager.ConnectionStrings["ASPNETDBConnectionString1"].ConnectionString;
       SqlConnection myConnect = new SqlConnection(strConnectionString);

       string strCommandText = "SELECT CategoryID, CatName  from Category";

       SqlCommand cmd = new SqlCommand(strCommandText, myConnect);
       myConnect.Open();

       DataList1.DataBind();

       // CommandBehavior.CloseConnection will automatically close connection
       SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
       return reader;
   }

   protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
   {
       DataList1.DataSourceID = "SqlDataSource1";


       if (RadioButtonList1.SelectedIndex == 0)
       {
           Session["catID"] = 1;

       }
       else if (RadioButtonList1.SelectedIndex == 1)
       {
           Session["catID"] = 2;

       }
       else if (RadioButtonList1.SelectedIndex == 2)
       {
           Session["catID"] = 3;

       }
       else if (RadioButtonList1.SelectedIndex == 3)
       {
           Session["catID"] = 4;

       }
       else if (RadioButtonList1.SelectedIndex == 4)
       {
           Session["catID"] = 5;

       }

       else
       {
           Session["catID"] = 8;

       }

   }