PP/Transportation/AddVehicle.cs

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.Data.SqlClient;

namespace Transportation
{
    public partial class AddVehicle : Form
    {
        SqlCommand query = null;
        SqlDataReader reader = null;
        public AddVehicle()
        {
            InitializeComponent();
        }

        private void AddVehicle_Load(object sender, EventArgs e)
        {
            
            query = new SqlCommand("select surname_executor + ' ' + name_executor + ' ' + midname_executor from Executors", dbhelper.sqlConnection);
            reader = query.ExecuteReader();
            while(reader.Read())
            {
                ExecutorsCB.Items.Add(reader.GetString(0));
            }
            reader.Close();
            query = new SqlCommand("select name_category from Category_Trailer", dbhelper.sqlConnection);
            reader = query.ExecuteReader();
            while (reader.Read())
            {
                CategoryCB.Items.Add(reader.GetString(0));
            }
            reader.Close();
        }

        private void AddBtn_Click(object sender, EventArgs e)
        {
            query = new SqlCommand($"select code_executor from executors where (surname_executor + ' ' + name_executor + ' ' + midname_executor) like '{ExecutorsCB.SelectedItem}'", dbhelper.sqlConnection);
            string codeExecutor = query.ExecuteScalar().ToString();
            query = new SqlCommand($"select code_category from category_trailer where name_category like '{CategoryCB.SelectedItem}'", dbhelper.sqlConnection);
            string codeCategory = query.ExecuteScalar().ToString();
            query = new SqlCommand("insert into vehicles (code_executor, brand_vehicle, model_vehicle, number_vehicle, code_category, volume_body, length_body, width_body, height_body) values (@code_executor, @brand_vehicle, @model_vehicle, @number_vehicle, @code_category, @volume_body, @length_body, @width_body, @height_body)", dbhelper.sqlConnection);
            query.Parameters.AddWithValue("code_executor", codeExecutor);
            query.Parameters.AddWithValue("brand_vehicle", BrandTB.Text);
            query.Parameters.AddWithValue("model_vehicle", ModelTB.Text);
            query.Parameters.AddWithValue("number_vehicle", NumberMTB.Text);
            query.Parameters.AddWithValue("code_category", codeCategory);
            query.Parameters.AddWithValue("volume_body", VolumeNUD.Value);
            query.Parameters.AddWithValue("length_body", LengthNUD.Value);
            query.Parameters.AddWithValue("width_body", WidthNUD.Value);
            query.Parameters.AddWithValue("height_body", HeightNUD.Value);
            
            if(query.ExecuteNonQuery().ToString().Equals("1"))
            {
                MessageBox.Show("Добавление прошло успешно!", "Уведомление", MessageBoxButtons.OK, MessageBoxIcon.Information);
                this.Close();
            }

        }
    }
}