binding listview depending on query string not working

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ListView

Hi all
i am facing a problem as my list view not showing any result, in the index page of my application i have SrchtxtBox which query string will be created depending on text entering and then passed to another page which is adsdetail.aspx. here is the code on textbox in the index page:

Response.Redirect("SearchResult.aspx?Searchfor=" + Srchtxt.Text);

and here is the code of my listview on adsdetail.aspx which not showing any result:

if (!IsPostBack)
            {
                string result = Convert.ToString(Request.QueryString["Searchfor"]);
                
                if (Request.QueryString["Searchfor"] != null)
                {

                    HttpCookie cookie = Request.Cookies.Get("Location");

                    if (cookie["Location"] != null)
                    {

                        using (SqlConnection srchsql = new SqlConnection(sc))
                        {
                            // Open your connection
                            srchsql.Open();

                            // Build your data adapter
                            SqlDataAdapter DAsearch = new SqlDataAdapter("SELECT [AdsID], [AdsDate], [AdsPrice], [AdsTit], SUBSTRING([AdsDesc],1,50) as AdsDesc, [Section], [Category], [Wtags], [Country], [State], [City],[Img1] FROM [ads] WHERE (([Country] = @Country) AND ([Wtags] = @Wtags))", sc);
                           
                            // Define your data set
                            DataSet DSsrchP = new DataSet();
                            
                            // Add your parameters to your data adapter
                            DAsearch.SelectCommand.Parameters.AddWithValue("@Country", cookie.Value);
                            DAsearch.SelectCommand.Parameters.AddWithValue("@Wtags", result);



                            // Fill your data set
                            DAsearch.Fill(DSsrchP);

                            // Bind your results
                            resultshowlistview.DataSource = DSsrchP.Tables[0];
                            resultshowlistview.DataBind();
                        }
                    }
                    else
                    {
                        // Your Session key could not be found, consider displaying an error
                    }
                }
            }