problem in connection string(i can retrieve data but i cant store in database)

private void button1_Click_1(object sender, EventArgs e)
     {

            try
            {
                string fname = txtfname.Text;
                string lname = txtlname.Text;
                string house = txthouse.Text;
                string city = txtcity.Text;
                string country = txtcountry.Text;
                string state = txtstate.Text;
                string post = txtpost.Text;
                string mail = txtmail.Text;
                string blood = txtblood.Text;
                string mobile = txtmobile.Text;
                string dob = txtdob.Text;
                if (label24.Text != "file path")
                {
                    byte[] imagedata = ReadFile(label24.Text);
                    string conn = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|NORTHWND.MDF;Integrated Security=True;User Instance=True";
                    SqlConnection con = new SqlConnection(conn);
                    string query = "insert into address(firstname,lastname,house,city,country,state,post,mail,blood,mobile,dob,image)values
('" + fname + "','" + lname + "','" + house + "','" + city + "','" + country + "','" + state + "','" + post + "','" + mail + "','" + blood + "','" + mobile + "','" + dob + "',@image)";
                    SqlCommand cmd = new SqlCommand(query, con);
                    cmd.Parameters.Add(new SqlParameter("@image", (object)imagedata));
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                    rInsert.Text = "Address Saved Sucessfully...!!!";
                }
                else
                    MessageBox.Show("Please Insert a Photo", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);

            }

            catch (Exception x)
            {
                MessageBox.Show(x.ToString());
            }


        }

        byte[] ReadFile(string sPath)
        {
            //Initialize byte array with a null value initially.
            byte[] data = null;

            //Use FileInfo object to get file size.
            FileInfo fInfo = new FileInfo(sPath);
            long numBytes = fInfo.Length;

            //Open FileStream to read file
            FileStream fStream = new FileStream(sPath, FileMode.Open, FileAccess.Read);

            //Use BinaryReader to read file stream into byte array.
            BinaryReader br = new BinaryReader(fStream);

            //When you use BinaryReader, you need to supply number of bytes to read from file.
            //In this case we want to read entire file. So supplying total number of bytes.
            data = br.ReadBytes((int)numBytes);
            return data;
        }