Ошибка при подключении к SQL Server

 SqlConnectionStringBuilder bldr;
        public InputForm()
        {
           
            InitializeComponent();
            bldr = new SqlConnectionStringBuilder();
            bldr.DataSource = @".\SQLExpress";
            bldr.IntegratedSecurity = true;
            bldr.AttachDBFilename = @"D:\ISIT\La2DB\LineageII.mdf";
        }

bldr.DataSource = @".\SQLExpress"

bldr.DataSource = @"(local)\SQLExpress"

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace WindowsFormsApplication2
{
    public partial class OutoutTable : Form
    {
        string strSQL, strOp;
        SqlConnectionStringBuilder bldr;
        SqlConnection cn;
        public OutoutTable()
        {
            InitializeComponent();
            bldr = new SqlConnectionStringBuilder();
            bldr.DataSource = @"(local)\HERO";
            bldr.IntegratedSecurity = true;
            bldr.AttachDBFilename = @"D:\ISIT\La2DB\LineageII.mdf";
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
 
            string nameTable = "";
            string strSQL;
            switch (comboBox.SelectedIndex)
            {
                case 0: nameTable = "monster"; break;
                case 1: nameTable = "location"; break;
                case 2: nameTable = "item_armor"; break;
                case 3: nameTable = "item_weapon"; break;
                case 4: nameTable = "item_resurce"; break;
                case 5: nameTable = "item_other"; break;
            }
            strSQL = "SELECT*FROM" + nameTable;
            using (cn = new SqlConnection(bldr.ConnectionString))
            {
 
                try
                {
                    cn.Open();
                    SqlCommand cmd = new SqlCommand(strSQL, cn);
                    SqlDataReader rdr = cmd.ExecuteReader();
 
                    DataTable t = new DataTable();
                    t.Load(rdr);
                    dataGridView1.DataSource = t.DefaultView;
                    cn.Close();
 
                }
                catch (SqlException ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
         
        }
 
        private void checkBox2_CheckedChanged(object sender, EventArgs e)
        {
 
        }
 
        private void dataGridView2_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
 
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            if (checkArmor.Checked == false || checkLocation.Checked == false)
                strOp = "OR";
            else strOp = "AND";
            strSQL = " select monster.name_monster as Name, location.name_location as Location, item_weapon.name_item_weapon as Weapon, item_armor.name_item_armor as Armor, item_resurce.name_item as resurce, item_other.name_item_other as Other_item from info_monster inner join monster on monster.id_monster= info_monster.id_monster inner join location on location.id_location=info_monster.id_location  inner join item_weapon on item_weapon.id_item_weapon=info_monster.id_item_weapon  inner join item_armor on item_armor.id_item_armor=info_monster.id_item_armor  inner join item_resurce on item_resurce.id_item =info_monster.id_item_resurce inner join item_other on item_other.id_item_other=info_monster.id_item_other WHERE Armor LIKE'" + textPoiiskArmor.Text + "%' " + strOp + "Location='" + textPoiskLocation + "'";
 
            if (checkLocation.Checked == true)
                strSQL = " select monster.name_monster as Name, location.name_location as Location, item_weapon.name_item_weapon as Weapon, item_armor.name_item_armor as Armor, item_resurce.name_item as resurce, item_other.name_item_other as Other_item from info_monster inner join monster on monster.id_monster= info_monster.id_monster inner join location on location.id_location=info_monster.id_location  inner join item_weapon on item_weapon.id_item_weapon=info_monster.id_item_weapon  inner join item_armor on item_armor.id_item_armor=info_monster.id_item_armor  inner join item_resurce on item_resurce.id_item =info_monster.id_item_resurce inner join item_other on item_other.id_item_other=info_monster.id_item_other WHERE Location='" + textPoiskLocation.Text + "'";
 
            using (cn = new SqlConnection(bldr.ConnectionString))
            {
                try
                {
                    cn.Open();
                    SqlCommand cmd = new SqlCommand(strSQL, cn);
                    SqlDataReader rdr = cmd.ExecuteReader();
 
                    DataTable t = new DataTable();
                    t.Load(rdr);
                    dataGridView2.DataSource = t.DefaultView;
                    cn.Close();
 
                }
                catch(SqlException ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }
 
        private void button3_Click(object sender, EventArgs e)
        {
            string strSQL2;
            strSQL2 = " select monster.name_monster as Name, location.name_location as Location, item_weapon.name_item_weapon as Weapon, item_armor.name_item_armor as Armor, item_resurce.name_item as resurce, item_other.name_item_other as Other_item from info_monster inner join monster on monster.id_monster= info_monster.id_monster inner join location on location.id_location=info_monster.id_location  inner join item_weapon on item_weapon.id_item_weapon=info_monster.id_item_weapon  inner join item_armor on item_armor.id_item_armor=info_monster.id_item_armor  inner join item_resurce on item_resurce.id_item =info_monster.id_item_resurce inner join item_other on item_other.id_item_other=info_monster.id_item_other ;";
            using (cn = new SqlConnection(bldr.ConnectionString))
            {
                try
                {
                    cn.Open();
                    SqlCommand cmd = new SqlCommand(strSQL2, cn);
                    SqlDataReader rdr = cmd.ExecuteReader();
 
                    DataTable x = new DataTable();
                    x.Load(rdr);
                    dataGridView3.DataSource = x.DefaultView;
 
                    cn.Close();
 
                }
                catch (SqlException ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }
 
    }
}

strSQL = "SELECT*FROM" + nameTable;