本人在做一个银企互联的测试，抛出了异常：”基础连接已经关闭: 连接被意外关闭“，请教大佬们该怎么办

本人在做一个银企互联的测试，下边是代码
string postData = "fxml=" + strXml.InnerXml;
string result = "";
Encoding encoding = Encoding.GetEncoding("GBK");
byte[] dataArray = encoding.GetBytes(postData);
//创建请求
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ServerPage);
request.Credentials = CredentialCache.DefaultCredentials;
request.Method = "POST";
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)";
request.ContentLength = dataArray.Length;
request.ContentType = "application/x-www-form-urlencoded";
request.KeepAlive = false;
//创建输入流
Stream dataStream = null;
try
{
dataStream = request.GetRequestStream();
}
catch (Exception ex)
{
return "连接服务器失败";//连接服务器失败
}
try
{
dataStream.Write(dataArray, 0, dataArray.Length);
dataStream.Close();
}
catch (Exception ex)
{
return "连接服务器失败";//连接服务器失败

        }
        //发送请求

        //读取返回消息
        string res = string.Empty;
        try
        {
            WebResponse myWebResponse = request.GetResponse();

            StreamReader reader = new StreamReader(myWebResponse.GetResponseStream(), Encoding.GetEncoding("gb2312"));
            res = reader.ReadToEnd();

            reader.Close();
        }
        catch (Exception ex)
        {
            return res = "连接服务器失败";//连接服务器失败
        }
        return res;
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1、网络问题或对方服务未启动，可以ping下对方ip看看是否可以连接上；

2、内部代码处理异常，比如处理超时、未关闭连接、内存溢出。