private void okButton_Click(object sender, EventArgs e)
        {
            if (propertyInfo == null)
                propertyInfo = new Database.PropertyInfo();

            propertyInfo.name = nameBox.Text;
            propertyInfo.policeVisibility = policeVisibility.Checked;
            this.DialogResult = DialogResult.OK;
            this.Close();
        }
        // ----------------------------------------------------------
        private Database.PropertyInfo getCurrentProperty()
        {
            if (dataGridView.SelectedRows.Count != 1)
            {
                return null;
            }

            Database.PropertyInfo propertyInfo = new Database.PropertyInfo();
            propertyInfo.id = Convert.ToUInt64(dataGridView.SelectedRows[0].Cells[0].Value);
            propertyInfo.name = Convert.ToString(dataGridView.SelectedRows[0].Cells[1].Value);
            propertyInfo.policeVisibility = Convert.ToBoolean(dataGridView.SelectedRows[0].Cells[2].Value);

            return propertyInfo;
        }