文件上传

private   void  Button2_Click( object  sender, System.EventArgs e)         ... {                        DateTime now = DateTime.Now ;            //取现在时间到DataTime类的对象now中            string strBaseLocation = Server.MapPath("MSIS_CSV/");            //这是文件将上传到的服务器的绝对目录            if (File1.PostedFile.ContentLength != 0) //判断选取对话框选取的文件长度是否为0            ...{                //                                message_upload="";                if (Path.GetExtension(File1.PostedFile.FileName)==".csv")                ...{                    try                    ...{                        File1.PostedFile.SaveAs(strBaseLocation+filename+".csv");                        message_upload="文件上传成功！/n";                        upload_csv();                    }                    catch                    ...{                        Response.Write("<script language=javascript>alert('请确保文件格式正确!');</script>");                    }                }                else                ...{                    Response.Write("<script language=javascript>alert('请确保文件是CSV文件!!');</script>");                }                            }             else            ...{                Response.Write("<script language=javascript>alert('请选择要上传的文件!');</script>");                    }                        }