private void dataGridView1_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e){  ////利用 WebClient 來下載圖片  using (WebClient wc = new WebClient())  {    ////WebClient 下載完畢的響應事件綁定    wc.DownloadDataCompleted += new DownloadDataCompletedEventHandler(wc_DownloadDataCompleted);    ////開始異步下載，圖片URL路徑請根據實際情況自己去指定    ////同時將DataGridView當前行的行號傳遞過去，用于指定圖片顯示的CELL    wc.DownloadDataAsync(new Uri(this.dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString()),      e.RowIndex);  }}void wc_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e){  ////如果下載過程未發生錯誤，并且未被中途取消  if (e.Error == null && !e.Cancelled)  {    ////將圖片顯示于對應的指定單元格， e.UserState 就是傳入的 e.RowIndex    ////e.Result 就是下載結果    this.dataGridView1.Rows[(int)e.UserState].Cells["src"].Value = e.Result;    // this.dataGridView1.Rows[(int)e.UserState].Cells["test"].Value = GetImage("1");  }}