tbf/Workplace/LocalSettingsFormForPolozka.cs

using System;
using System.Windows.Forms;

namespace Workplace
{
    public partial class LocalSettingsFormForPolozka : Form
    {
        public string BlackListFileName;

        public LocalSettingsFormForPolozka()
        {
            InitializeComponent();
            ControlBox = false;
        }

        private void browseButton_Click(object sender, EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();
            if (!string.IsNullOrEmpty(BlackListFileName)) { dlg.FileName = BlackListFileName; }

            BlackList bl;
            DialogResult dr = dlg.ShowDialog();
            if (dr == DialogResult.OK)
            {
                if (dlg.FileName == string.Empty)
                {
                    BlackListFileName = string.Empty;
                    blackListFileTextBox.Text = BlackListFileName;
                    blackListCodesCountLabel.Text = "Black list deleted";
                }
                else if (((bl = BlackList.FromFile(dlg.FileName)) != null) && (bl.Codes.Count > 0))
                {
                    BlackListFileName = dlg.FileName;
                    blackListFileTextBox.Text = BlackListFileName;
                    blackListCodesCountLabel.Text = bl.Codes.Count.ToString();
                }
                else
                {
                    BlackListFileName = string.Empty;
                    blackListFileTextBox.Text = BlackListFileName;
                    blackListCodesCountLabel.Text = "An invalid or empty black list";
                }
            }
        }

        private void saveButton_Click(object sender, EventArgs e)
        {

        }

        private void cancelButton_Click(object sender, EventArgs e)
        {

        }
    }
}