VB.NET-用Socket类写个POST/GET程序.在服务器返回中的信息里,中文件为何变成了编码??

我用VB.NET写了个Socket程序.作用是用于GET或POST网站.当我用该程发出POST命令时,服务器返回信息中的中文却变成了其它编码!怎么样才能将服务返回信息中的汉字不要变成其它编码?如我发POST信息为(下面其中两处的"11111"为用户名和密码,是不存在的用户名):POST /getin.cgi HTTP/1.1Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*Referer: http://www.***.com/getin.cgiAccept-Language: zh-cnContent-Type: application/x-www-form-urlencodedAccept-Encoding: gzip, deflateUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322)Host: www.****.comContent-Length: 31Connection: Keep-AliveCache-Control: no-cacheid=&username=11111&passwd=11111=======================================================================''''***************把这个发给服务器后,将返回以下信息:**************=======================================================================HTTP/1.1 200 OKServer: Microsoft-IIS/5.0Date: Sat, 20 Aug 2005 07:41:51 GMTConnection: closeContent-Type: text/html<center><table border=0 height=60% align=center><tr><td height=60% valign=middle align=center><font size=3 color=red>6T2;Fp#,4KSC;';9C;W"2a!#</font><p><a href=javascript:history.back()><font color=000000 size=2>75;X</font></a></td></tr></table>在这些返回的信息中,其中(6T2;Fp#,4KSC;';9C;W"2a!#)原本是汉字的(对不起，此用户还没注册。)意思(我同样用VB写了个POST程序,返回的信息的汉字是正常)所以不是为什么我用VB.NET的Socket类写同样的效果程序返回的信息中带有的汉字却变成了类似上面的编码(也不知是什么编,是不是UNICODE编?).有什么办法可以让它显示汉字吗？以下为Socket类片段代码(主要的那部份): Private Sub startmain()'''开始运行........ Dim cilen1 As New cilen(hostip, hostport)''''hostip是服务IP或地址,hostport是服务器端口 Dim str As String str = TextBox4.Text''''TextBox4.text中的内容为上面POST命令要发送的信息 cilen1.abc(str) cilen1 = Nothing End Sub Class cilen Public str As String ''''''返回网站的代号 Public sip As String Public sport As String Dim surl As String Public Bool As Boolean Dim serverIP As IPAddress Dim serverhost As IPEndPoint Dim clientSocket As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) Dim httpReq As String Dim buffer(1024) As Byte Dim bufferhttp(1024) As Byte Dim byteCount As Int16 Public Sub New(ByVal ip As String, ByVal port As String) On Error GoTo ee sip = ip sport = port serverIP = Dns.Resolve(sip).AddressList(0) serverhost = New IPEndPoint(serverIP, 80) Exit Subee: End Sub ''''构造函数 Public Function rconnect() If serverIP Is Nothing Then MsgBox("无法连接此网站!请点击停止", 0, "提示") Exit Function End If Try clientSocket.Connect(serverhost) If clientSocket.Connected = False Then MsgBox("1") MsgBox("Connect Error.", MsgBoxStyle.Critical, "HTTP") Exit Function End If Catch ex As Exception rconnect = "1" MsgBox("2") MsgBox(ex.StackTrace.ToString(), MsgBoxStyle.Critical, "Exception") End Try End Function '''重新连接 Public Sub abc(ByVal url As String) If serverIP Is Nothing Then MsgBox("无法连接此网站!请点击停止进行结束!", 0, "提示") GoTo ee End If str = rconnect() If str = "1" Then GoTo ee End If surl = url Try httpReq = surl & ControlChars.CrLf & ControlChars.CrLf bufferhttp = ASCII.GetBytes(httpReq) clientSocket.Send(bufferhttp, Len(httpReq), SocketFlags.None) byteCount = clientSocket.Receive(buffer, buffer.Length, 0) str = ASCII.GetString(buffer, 0, byteCount) + ControlChars.CrLf Do While byteCount > 0 byteCount = clientSocket.Receive(buffer, buffer.Length, 0) str = str & ASCII.GetString(buffer, 0, byteCount) + ControlChars.CrLf Loop Catch ex As Exception MsgBox(ex.StackTrace.ToString(), MsgBoxStyle.Critical, "Exception") GoTo ee End Try clientSocket.Shutdown(SocketShutdown.Both) clientSocket.Close() serverhost = Nothing Exit Sub ee: clientSocket.Close() End Sub ''''发送命令并获取数据 Protected Overrides Sub finalize() 'MsgBox("完成任务!", 0, "提示") End Sub ''''析构函数 End Class    其中在类Class cilen中的变量字符串str就是服务返回的信息,怎么样把str里面的信息中原本是汉字的编码变成原样?