click button

I set Breakpoint on button event 

when i clicked  on button first time it didnt happen any thing when i clicked  for second time it went to VS and show  button click event where i set breakpoint  and in Intelli Trace wrote every thing that i worte in my last reply 

this is my code in search.aspx

using System;
using System.Collections.Generic;

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;


public partial class mainsearch : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        
       
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
       
 

        
            SqlConnection _cn = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["behtopConnectionString"].ConnectionString);
           
            SqlCommand _cm2 = new SqlCommand("Trade", _cn);
            _cm2.CommandType = CommandType.StoredProcedure;
            _cm2.Parameters.Add("@Keyword", txtsearch.Text);
            if (_cn.State != System.Data.ConnectionState.Open) _cn.Open();




           SqlDataReader _dr = _cm2.ExecuteReader();

         
            while (_dr.Read())
            {
                GridView1.DataSource = _dr;
                GridView1.DataBind();





                

            }

           
        if (_cn.State != System.Data.ConnectionState.Closed) _cn.Close();

        
        
    }



    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        string Code = (sender as LinkButton).CommandArgument;
        string T_Code = Code.Split('_')[0];
        string F_Code = Code.Split('_')[1];


            
        if (T_code == "11") 
        {
           Response.Redirect(string.Format("furniture.aspx?Code={0}",F_Code)); 
        }
       
        if (T_code == "33")      
        {            Response.Redirect("book.aspx");
        }
        
    }
    
}