c#html 保存pdf

taTable dt1 = ds1.Tables[0];
            if (ds1 != null && dt1.Rows.Count > 0)
            {
                string tm1 = dt1.Rows[0]["event_time"].ToString();
                string filename1 = dt1.Rows[0]["filename"].ToString().Trim();
                string filetype1 = dt1.Rows[0]["name"].ToString().Trim();

                if (Request["t"] != null)
                {
                    filetype.Text = "<a href='../../Module/GetIndexFileMail.aspx?tm="   tm1   "&Str="   filename1   " &SensitiveWord=&filetype="   filetype1   "&area=&type=1' target='_blank'>"   filetype1   "</a>";

                }
                else
                {
                    filetype.Text = "<a href='../manage/Module/GetIndexFileMail.aspx?tm="   tm1   "&Str="   filename1   " &SensitiveWord=&filetype="   filetype1   "&area=&type=1' target='_blank'>"   filetype1   "</a>";
                }