Dynamically Linkbutton Click Event

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.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;

public partial class Dynamic_link : System.Web.UI.Page
{
    SqlConnection cnn = new SqlConnection();
    protected void Page_Load(object sender, EventArgs e)
    {
        cnn.ConnectionString=ConfigurationManager.ConnectionStrings["jin"].ConnectionString;
        if(cnn.State==ConnectionState.Closed)
        {
            cnn.Open();
        }  
        SqlCommand cm = new SqlCommand("select itemname from menu", cnn);  
          cm.CommandType = CommandType.Text;  
         SqlDataAdapter da = new SqlDataAdapter(cm);
        DataSet dt = new DataSet();
        da.Fill(dt);
         Repeater Repeater1 = new Repeater();
        Repeater1.DataSource = dt;
        Repeater1.DataBind();
        if (cnn.State == ConnectionState.Open)
        {
            cnn.Close();
        }  
        foreach (RepeaterItem repeatItem in Repeater1.Items)
        {
            // if condition to add HeaderTemplate Dynamically only Once  
            if (repeatItem.ItemIndex == 0)
            {
                RepeaterItem headerItem = new RepeaterItem(repeatItem.ItemIndex, ListItemType.Header);
                HtmlGenericControl hTag = new HtmlGenericControl("h4");
               hTag.InnerHtml = "Menu Collection";
                repeatItem.Controls.Add(hTag);
            }

            // Add ItemTemplate DataItems Dynamically  
            //SqlDataReader dr = Int32.Parse;
            RepeaterItem repeaterItem = new RepeaterItem(repeatItem.ItemIndex, ListItemType.Item);
            LinkButton lnk = new LinkButton();
            lnk.ID = "lnk_itemname";
            lnk.Text = String.Format("{0}",(dt.Tables[0].Rows[repeatItem.ItemIndex]["itemname"]));
            lnk.Click += new System.EventHandler(link_Click);
            repeatItem.Controls.Add(lnk);
           // Add SeparatorTemplate Dynamically  
            repeaterItem = new RepeaterItem(repeatItem.ItemIndex, ListItemType.Separator);
            LiteralControl ltrlHR = new LiteralControl();
            ltrlHR.Text = "<hr />";
            repeatItem.Controls.Add(ltrlHR);
        }

        // Add Repeater Control as Child Control  
        // of Panel Control  
        Panel1.Controls.Add(Repeater1);  
    }

    protected void link_Click(object sender, EventArgs e)
    {
        cnn.ConnectionString = ConfigurationManager.ConnectionStrings["jin"].ConnectionString;
       SqlDataAdapter da = new SqlDataAdapter();
        da.SelectCommand = new SqlCommand("str_get_subitemDetails", cnn);
        da.SelectCommand.CommandType = CommandType.StoredProcedure;
         DataSet ds = new DataSet();
         DataTable dt = new DataTable("submenu");
        da.Fill(dt);

        Session["subitem_name"] = dt.Rows[0]["subitem_name"].ToString();
        Session["item_descript"] = dt.Rows[0]["item_descript"].ToString();
        Session["item_rate"] = dt.Rows[0]["item_rate"].ToString();
        Response.Redirect("getsubitem.aspx");
    }
    
    
}

USE [JIN]
GO
/****** Object:  StoredProcedure [dbo].[str_get_subitemDetails]    Script Date: 03/06/2013 16:51:55 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[str_get_subitemDetails]
@item_id nvarchar(50),
@itemname nvarchar(50),
@subitem_name nvarchar(50),
@item_descript nvarchar(100),
@item_rate decimal(18,2)
as
begin
select submenu.subitem_name,submenu.item_descript,submenu.item_rate from submenu join menu on menu.item_id=submenu.item_id where menu.itemname=@itemname
end