ASP.net 下載檔案處理

ASP.net 下載檔案處理
最近有個項目需要bs的下載檔案處理，以前記得做c#時候儲存檔案時候，直接通過fileopendialog或者是filesave控制項來執行，但是bs的好像沒有現成的控制項進行對下載檔案的直接選取控制項，再網上找了些相關資料，對於下載大致分為二種方式。
1.直接通過擷取用戶端檔案和路徑進行下載，代碼如下
try
                    {
                      
                        string fileName ="檔案名稱";
                        string filePath = Server.MapPath("/");//路徑                       

                        FileInfo fileInfo = new FileInfo(filePath);
                        if (fileInfo.Exists)
                        {
                            Response.Clear();
                            Response.ClearContent();
                            Response.ClearHeaders();
                            Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
                            Response.AddHeader("Content-Length", fileInfo.Length.ToString());
                            Response.AddHeader("Content-Transfer-Encoding", "binary");
                            Response.ContentType = "application/octet-stream";
                            Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
                            Response.WriteFile(fileInfo.FullName);
                            Response.Flush();
                            Response.End();
                        }
                        else
                        {
                            Alert.Show("下載的當前檔案不存在，請確認");
                        }
                    }
                    catch
                    {
                        Alert.Show("下載失敗");
                    }

2.通過直接調用<a href進行下載如下：
 通過建立一個label控制項，當單擊label控制項顯示到下載的連結頁面
 this.Label1.Text = "<a href=/" + 需要檔案下載的路徑+ " target=_blank>下載</a>";
當單擊label時候，連結到具體檔案下載。