在WinForm中通过HTTP协议向服务器端上传文件

在WinForm中通过HTTP协议向服务器端上传文件(14)       "Content-Disposition: form-data; name=\"" +Key+"\"\r\n\r\n") );
     
     this.oPostData.Write( Value );

     this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes("\r\n") );
     break;
    default:
     this.oPostData.Write( Value );
     break;
   }
  }

  public void AddPostKey(string Key, string Value)
  {
   this.AddPostKey(Key,Encoding.GetEncoding(1252).GetBytes(Value));
  }

  /// <summary>
  /// Adds a fully self contained POST buffer to the request.
  /// Works for XML or previously encoded content.
  /// </summary>
  /// <param name="PostBuffer"></param>
  public void AddPostKey(string FullPostBuffer)
  {
   this.oPostData.Write( Encoding.GetEncoding(1252).GetBytes(FullPostBuffer) );
  }

  public bool AddPostFile(string Key,string FileName)
  {
   byte[] lcFile; 

   if (this.nPostMode != 2) {
    this.cErrorMsg = "File upload allowed only with Multi-part forms";
    this.bError = true;
    return false;
   }

   try
   {   
    FileStream loFile = new FileStream(FileName,System.IO.FileMode.Open,System.IO.FileAccess.Read);

    lcFile = new byte[loFile.Length];