var request = this.Context.Request;

HttpPostedFile files = request.Files["idFile"];

string newname = null;

if (files.ContentLength > 0) {

            try  

            {      

                string url;  

                string urlsql;

               var jurl =  AppDomain.CurrentDomain.BaseDirectory;

               var fod = "UpImageFiles/";

                

                string fn = files.FileName.Substring(files.FileName.LastIndexOf("\\") + 1);//获取文件名  

                int j = fn.LastIndexOf(".");

                string newexts = fn.Substring(j);

                string pname = IDCard;

                 newname = pname + newexts;

                string fp = "../UpImageFiles/";//服务器实际文件夹地址  

                string fpsql = "~/UpImageFiles/";//数据库中记录的文件夹地址  

                url = fp + newname;//服务器文件地址  

                urlsql = fpsql + newname;//服务器中记录的文件地址  

                var urldel = jurl + fod + newname;//图片的绝对路径

                if (System.IO.File.Exists(Server.MapPath(url)))  

                {  

                    //MessageBox.Show(this, "文件已存在！");  

                    File.Delete(urldel);

                }  

               

                    files.SaveAs(Server.MapPath(url));//上传  

                    string path = Server.MapPath(fp);  

                    //取得文件名(抱括路径)里最后一个"."的索引  

                    int i = fn.LastIndexOf(".");  

                    //取得文件扩展名  

                    string newext = fn.Substring(i);

                    string data = IDCard;//新名称  

                    FileInfo fii = new FileInfo(path + fn);  

                    urlsql = fpsql + data + newext;  

                    string path1 = fp + data + newext;  

                    FileInfo fi1 = new FileInfo(path1);  

                    if (fi1.Exists)  

                    {  

                        fi1.Delete();  

                    }

                }

              

            catch(Exception en)  

            {

                resultStr = "<script> alert('保存失败！" + en.Message + "');</script>";

               // MessageBox.Show(this, "出现错误，请重新上传！");  

            }

            }