vb 2015 c# ไม่สามารถ Login ใช้ database.mdf ที่อยู่ใน folder bin\debug ครับ

 private void button3_Click(object sender, EventArgs e)
        {            
            SqlConnection con = new SqlConnection(@"Server=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Database1.mdf");
            SqlDataAdapter da = new SqlDataAdapter("select count(*) from login where user ='" + textBox1.Text + "' and pass='" + textBox2.Text + "'", con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            if (dt.Rows[0][0].ToString() == "1")
            {
                Form2 f2 = new Form2();
                f2.Show();
            }
            else
            {
                MessageBox.Show("Username or Password is not correct!", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            textBox1.Clear();
            textBox2.Clear();
            textBox1.Focus();
        }