dsoframer.ocx 保存问题，超过5M的内容就保存不了？？？急急急

我用的是dsoframer.ocx  在线打开doc和保存5M以下的doc都没问题，一但内容多了，文件内容大于5M后怎么保存不了，而且很慢，不知道用什么方法可以解决，谢谢各位大哥。
 
editdoc.aspx代码如下：
 function SaveToWeb(){
             document.all.FramerControl1.HttpInit();
             document.all.FramerControl1.HttpAddPostString("RecordID","20060102200");
             document.all.FramerControl1.HttpAddPostString("UserID","aaa");
             document.all.FramerControl1.HttpAddPostCurrFile("FileData", "<%=FileName %>");
             document.all.FramerControl1.HttpPost("http://"+window.location.host+"/Read_doc/SaveDoc.aspx?FilePath=<%=FileName %>"); 
             alert("对文件的修改已经保存成功！");
             window.location.href ="http://127.0.0.1/sys/read.aspx" ;       
         }
 savedoc.aspx代码如下：
 using System;
 using System.Data;
 using System.Configuration;
 using System.Collections;
 using System.Web;
 using System.Web.Security;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using System.Web.UI.WebControls.WebParts;
 using System.Web.UI.HtmlControls;
 using System.IO;
 using System.Net;
 
public partial class DsoFramer_SaveDoc : System.Web.UI.Page
 {
     readonly int enterCount = 12;
     string[] requestValues = new string[3];
     protected void Page_Load(object sender, EventArgs e)
     {
 
        string newFile = Server.MapPath(".") + "\\" + Request.QueryString["FilePath"] + "";
         FileStream newDoc = new FileStream(newFile, FileMode.Create, FileAccess.Write);
         BinaryReader br = new BinaryReader(Request.InputStream);
         BinaryWriter bw = new BinaryWriter(newDoc);
         br.BaseStream.Seek(0, SeekOrigin.Begin);
         bw.BaseStream.Seek(0, SeekOrigin.End);
         int enterNo = 0;
         int streamHeadLen = 0;
 
        while (br.BaseStream.Position < br.BaseStream.Length)
         {
             streamHeadLen++;
             char c = (char)br.ReadByte();
             if (enterNo < enterCount)
             {
                 if (c == '\n')
                 {
                     enterNo++;
                 }
             }
             else
             {
                 break;
             }
         }
 
        br.BaseStream.Seek(0, SeekOrigin.Begin);
         string strTemp = System.Text.UTF32Encoding.Default.GetString(br.ReadBytes(streamHeadLen - 1));
         while (br.BaseStream.Position < br.BaseStream.Length - 38)
         {
             bw.Write(br.ReadByte());
         }
         br.Close();
         bw.Flush();
         bw.Close();
 
        string[] requestStrings = { "RecordID", "UserID" };
         for (int i = 0; i < requestStrings.Length; i++)
         {
             string str = "Content-Disposition: form-data; name=\"" + requestStrings[i] + "\"\r\n\r\n";
             int index = strTemp.IndexOf(str) + str.Length;
             if (index != str.Length - 1)
             {
                 for (int j = index; j < strTemp.Length; j++)
                 {
                     if (strTemp[j] != '\r')
                         this.requestValues[i] += strTemp[j];
                     else
                         break;
                 }
             }
         }
     }