Конфигурация файла проекта с добавлением условия реализации в БД

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Configuration;
using System.Data.SqlClient;
 
namespace SQL_DB
{
    public partial class Form1 : Form
    {
        private SqlConnection sqlConnection = null;
 
        private SqlDataAdapter adapter = null;
 
        private DataTable table = null;
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            sqlConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["KeyDB"].ConnectionString);
 
            sqlConnection.Open();
 
            adapter = new SqlDataAdapter("SELECT * FROM Postavki", sqlConnection);
 
            table = new DataTable();
 
            adapter.Fill(table);
 
            dataGridView1.DataSource = table;
 
            if (sqlConnection.State == ConnectionState.Open)
            {
                MessageBox.Show("Подключение установлено");
            }
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            SqlCommand command = new SqlCommand(
                $"INSERT INTO [Postavki] (Name_Of_Product, Price, CapacityCBM, Provider, ProviderAddress, ProviderPhone, ProviderEmail, Date_Of_Delivery, Quantity, Number_Of_Contract) VALUES (@Name_Of_Product, @Price, @CapacityCBM, @Provider, @ProviderAddress, @ProviderPhone, @ProviderEmail, @Date_Of_Delivery, @Quantity, @Number_Of_Contract)",
                sqlConnection);
 
            DateTime date = DateTime.Parse(textBox8.Text);
 
            command.Parameters.AddWithValue("Name_Of_Product", textBox1.Text);
            command.Parameters.AddWithValue("Price", textBox2.Text);
            command.Parameters.AddWithValue("CapacityCBM", textBox3.Text);
            command.Parameters.AddWithValue("Provider", textBox4.Text);
            command.Parameters.AddWithValue("ProviderAddress", textBox5.Text);
            command.Parameters.AddWithValue("ProviderPhone", textBox6.Text);
            command.Parameters.AddWithValue("ProviderEmail", textBox7.Text);
            command.Parameters.AddWithValue("Date_Of_Delivery", $"{date.Month}/{date.Day}/{date.Year}");
            command.Parameters.AddWithValue("Quantity", textBox9.Text);
            command.Parameters.AddWithValue("Number_Of_Contract", textBox10.Text);
 
            MessageBox.Show(command.ExecuteNonQuery().ToString());
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            table.Clear();
 
            adapter.Fill(table);
 
            dataGridView1.DataSource = table;
 
 
 
        }
 
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
 
        }
 
        private void button3_Click(object sender, EventArgs e)
        {
 
        }
    }
}