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string picURL = DateTime.Now.ToString("yyyyMMddhhmmss") + new Random().Next(1000, 9999) + "." + this.FileUpload1.FileName.Split('.')[this.FileUpload1.FileName.Split('.').Length - 1];
string date = DateTime.Now.ToString("yyyy-MM-dd");
string path = ConfigurationManager.AppSettings["pic.certify.path"] + date;
if (Directory.Exists(path) == false)
{
Directory.CreateDirectory(path);
}
this.FileUpload1.PostedFile.SaveAs(path + @"\" + picURL);