You are developing an ASP.NET Web page. You add the following markup to the page. You add the following code segment to the code-behind. You need to save the uploaded file and display a message to the user that indicates that the upload either succeeded or failed. Which two actions should you perform？（）
- AReplace line 3 with the following code segment. if （FileUpload1.HasFile）
- BReplace line 3 with the following code segment. if （FileUpload1.FileContent.Length > 0）
- CInsert the following code segment at line 6. FileUpload1.SaveAs（saveName）；
- DInsert the following code segment at line 6. FileUpload1.FileContent.CopyTo（new FileStream（saveName， FileMode.Open）；