System.Collections.Generic.List<string> filePaths = new System.Collections.Generic.List<string>();

                            System.Web.HttpFileCollection files = base.Request.Files;

                            if (files.Count > 0)

                            {

                                string basePatn = base.GetBasePath() + "MyDown\\";

                                IOHelper.ExistDirectory(basePatn, true);

                                string[] files2 = System.IO.Directory.GetFiles(basePatn);

                                for (int k = 0; k < files2.Length; k++)

                                {

                                    string path = files2[k];

                                    if (path.IndexOf(serial + "_") > -1)

                                    {

                                        System.IO.File.Delete(path);

                                    }

                                }

                                for (int j = 0; j < files.Count; j++)

                                {

                                    System.Web.HttpPostedFile file = files[j];

                                    string filePath = basePatn + serial + "_" + System.IO.Path.GetFileName(file.FileName);

                                    if (System.IO.File.Exists(filePath))

                                    {

                                        filePath = string.Concat(new object[]

										{

											filePath.Substring(0, filePath.LastIndexOf(".")),

											"(",

											System.DateTime.Now.Ticks,

											")",

											filePath.Substring(filePath.LastIndexOf("."))

										});

                                    }

                                    filePaths.Add(filePath);