C#/SQL

using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data;

namespace Chain_of_Stores
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Insert(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=C:\\Users\\Aleksandar\\source\\repos\\Chain_of_Stores\\Chain_of_Stores\\Database.mdf;Integrated Security=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("INSERT INTO Store VALUES (@Company,@FullName,@Address,@Manufacturer,@Invested,@Shareholding,@Number,@Registration)", con);
            cmd.Parameters.AddWithValue("@Company", Company.Text);
            cmd.Parameters.AddWithValue("@FullName", fullName.Text);
            cmd.Parameters.AddWithValue("@Address", Address.Text);
            cmd.Parameters.AddWithValue("@Manufacturer", Manufacturer.Text);
            cmd.Parameters.AddWithValue("@Invested", Invested.Text);
            cmd.Parameters.AddWithValue("@Shareholding", Shareholding.Text);
            cmd.Parameters.AddWithValue("@Number", Number.Text);
            cmd.Parameters.AddWithValue("@Registration", Registration.Text);
            cmd.ExecuteNonQuery();
            con.Close();
            MessageBox.Show("Successfully added into table!");
        }

        private void Select(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=C:\\Users\\Aleksandar\\source\\repos\\Chain_of_Stores\\Chain_of_Stores\\Database.mdf;Integrated Security=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("SELECT * FROM Store WHERE Shareholding>=50 AND Invested>=100000", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;
            con.Close();
        }
    }
}