Dictionary<int, Color> colorsList = new Dictionary<int, Color>();
        private void toolStripButton5_Click(object sender, EventArgs e)//ИЗМЕНЕНИЕ ЦВЕТА СТРОКИ
        {

            for (int i = 0; i < listView1.Items.Count; i++)
            {
                if (listView1.Items[i].Selected == true)
                {
                    if (toolStripComboBox1.Text == "Красный")
                        

                    {

                        listView1.Items[i].BackColor = Color.Red;
                        if (!colorsList.ContainsKey(i)) { colorsList.Add(i, Color.Red); }
                        else { colorsList[i] = Color.Red; }
                    }

                    else if (toolStripComboBox1.Text == "Желтый")

                    {

                        listView1.Items[i].BackColor = Color.Yellow;
                        if (!colorsList.ContainsKey(i)) { colorsList.Add(i, Color.Yellow); }
                        else { colorsList[i] = Color.Yellow; }
                    }

                    else if (toolStripComboBox1.Text == "Зеленый")

                    {

                        listView1.Items[i].BackColor = Color.Green;
                        if (!colorsList.ContainsKey(i)) { colorsList.Add(i, Color.Green); }
                        else { colorsList[i] = Color.Green; }

                    }

                    else if (toolStripComboBox1.Text == "Без цвета")

                    {

                        listView1.Items[i].BackColor = Color.White;
                        if (!colorsList.ContainsKey(i)) { colorsList.Add(i, Color.White); }
                        else { colorsList[i] = Color.White; }
                    }
                }
            }
        }

        void SetColor()
        {

            foreach (var c in colorsList)
            {
                if (listView1.Items.Count >= c.Key)
                    listView1.Items[c.Key].BackColor = c.Value;
            }
        }

private async void toolStripButton4_Click(object sender, EventArgs e)//ОБНОВЛЕНИЕ ДАННЫХ
        {

            listView1.Items.Clear();
            await LoadBanksAsync();
            SetColor();
        }