private void Form2_Load(object sender, EventArgs e)
        {
                SqlDataAdapter sda1 = new SqlDataAdapter("SELECT  * FROM СтруктурноеПодразделение", connection);
                DataTable dt1 = new DataTable();
                sda1.Fill(dt1);
                comboBox1.DataSource = dt1;
                comboBox1.ValueMember = "Ид_подразделения";
                comboBox1.DisplayMember = "Наименование_под";
                
                SqlDataAdapter sda5 = new SqlDataAdapter("SELECT * FROM Компания", connection); 
                DataTable dt5 = new DataTable();
                sda1.Fill(dt5);
                comboBox2.DataSource = dt5;
                comboBox2.ValueMember = "Ид_компании";
                comboBox2.DisplayMember = "Наименование_ком";
        } 

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
           
        }

        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {

        }