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if (FileUpload1.FileName == "") { return; } string filePath = Server.MapPath(@"~/UpLoadFile/ImageFile/"); string fileFullPath = filePath + FileUpload1.FileName; if (File.Exists(fileFullPath)) { //this.lblmessage.Text = "文件已經存在"; return; } else { FileUpload1.SaveAs(filePath + FileUpload1.FileName); return; }