asp.net关于上传文件修改文件名的方法

我这里主要用到了文件的复制方法

string SavesUPLoadPath = ConfigurationManager.AppSettings["AWUploadLocation"] + CompanyName + "/";
string copySavesUPLoadPath = ConfigurationManager.AppSettings["AWUploadLocation"] + CompanyName + "/";
if (!Directory.Exists(SavesUPLoadPath))//判断上传文件夹是否存在，若不存在，则创建
{
Directory.CreateDirectory(SavesUPLoadPath);//创建文件夹
}

SavesUPLoadPath = SavesUPLoadPath + FileUpload1.FileName;
FileUpload1.SaveAs(SavesUPLoadPath);
string NewSaveUPLoadPath = copySavesUPLoadPath + txtRefNO.Text + "-" + DateTime.Now.Year + "-" + DateTime.Now.Month + "-" + DateTime.Now.Day + "-" + DateTime.Now.Hour + "-" + DateTime.Now.Minute + ".pdf";
File.Copy(SavesUPLoadPath, NewSaveUPLoadPath); ---------把文件赋给新的 //复制文件的作用
File.Delete(SavesUPLoadPath); --在删除原来的
Response.Write(NewSaveUPLoadPath);

labeMess.Text = GetGlobalResourceObject("public", "UpLoadPdfsucceed").ToString();
btnSearch.Enabled = false;
btnUpLoadFile.Enabled = false;