UTF8编码C#Webrequest

我正试图提出一个webrequest并用希伯来语发送一个帖子数据 但是服务器端得到的是类似于“？？？？？？？”的信息，而不是希伯来语

    WebRequest request = WebRequest.Create(MyserverClient.Url + Constants.TaskUpdatePropertyURL);
((HttpWebRequest)request).AllowAutoRedirect = false;
((HttpWebRequest)request).KeepAlive = true;

request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded;";
request.Headers.Add("Pragma: no-cache");
request.Headers.Add(string.Format("Cookie: {0}", Client.phpId));
    request.Headers.Add(string.Format("requesttoken: {0}", requestToken));

    string postData = "Some Non-english text";      
    using (Stream dataStream = request.GetRequestStream())
{
    byte[] byteArray = Encoding.UTF8.GetBytes(postData);                
    dataStream.Write(byteArray, 0, byteArray.Length);               
    dataStream.Close();
}

    try{
     HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                // Get the stream containing content returned by the server.
         Stream dataStream2 = response.GetResponseStream ();
                // Open the stream using a StreamReader for easy access.
        StreamReader reader = new StreamReader (dataStream2);
                // Read the content. 
        responseFromServer = reader.ReadToEnd ();
    }
 return responseFromServer;

        } 

正如我所说，对于非英语的服务器，post数据是“？”，但我应该是“一些非英语文本”

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有什么建议吗

StreamReader readStream = new StreamReader (receiveStream, Encoding.UTF8);

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也许这会起作用： 用希伯来语

Encoding.GetEncoding(1255)

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您可以使用

Uri.EscapeDataString（string）

与2017.net4相比，这一个似乎不再适合我了。5@AltF4_是的，这篇文章是从2014年开始的，它可能仍然适用于旧版本