/// <summary>
        /// 图片删除
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnDelete_Click(object sender, EventArgs e)
        {
            int index = tabControl1.SelectedIndex + 1;

            MapDBClass.DeletePicture(_MapId, _LayerId, _ObjectId, DateList.Text, index);
            tabControl1.TabPages.RemoveAt(tabControl1.SelectedIndex);
            index = 1;
            foreach (TabPage page in tabControl1.TabPages)
            {
                page.Text = index.ToString();
                index++;
            }
        }