PING错误C#-参数名称：主机名

我需要帮助。。我正在检查PC的用户是否连接到Internet。。 它对我有用。。对很多人来说。。但对某人来说不是

它正在将其写入输出_log.txt

错误：

ArgumentNullException: Argument cannot be null.

Parameter name: hostName
  at System.Net.Dns.GetHostByName (System.String hostName) [0x00000] in <filename unknown>:0 

  at System.Net.NetworkInformation.Ping.GetNonLoopbackIP () [0x00000] in <filename unknown>:0 

  at System.Net.NetworkInformation.Ping.SendPrivileged (System.Net.IPAddress address, Int32 timeout, System.Byte[] buffer, System.Net.NetworkInformation.PingOptions options) [0x00000] in <filename unknown>:0 

  at System.Net.NetworkInformation.Ping.Send (System.Net.IPAddress address, Int32 timeout, System.Byte[] buffer, System.Net.NetworkInformation.PingOptions options) [0x00000] in <filename unknown>:0 

  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress, Int32 timeout, System.Byte[] buffer, System.Net.NetworkInformation.PingOptions options) [0x00000] in <filename unknown>:0 

  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress, Int32 timeout, System.Byte[] buffer) [0x00000] in <filename unknown>:0 

  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress, Int32 timeout) [0x00000] in <filename unknown>:0 

  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress) [0x00000] in <filename unknown>:0 

  at (wrapper remoting-invoke-with-check) System.Net.NetworkInformation.Ping:Send (string)

  at Internet.Connection.Check () [0x00000] in <filename unknown>:0 

  at MyGame.Load.Loader.StartLoading () [0x00000] in <filename unknown>:0 

  at Loader+<Start>c__IteratorA.MoveNext () [0x00000] in <filename unknown>:0 

(Filename:  Line: -1)

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所以请帮助那个人，他们的平台是什么？Mb。检查.NET版本可能已修复。。使用其他脚本

namespace Internet
{
    using System;
    using System.Net.NetworkInformation;
    using UnityEngine;

    public class Connection
    {
        public static void Check()
        {
            System.Net.NetworkInformation.Ping ping = new System.Net.NetworkInformation.Ping();
            if (ping.Send("89.203.249.74").Status != IPStatus.Success)
            {
                Debug.Log("NO INTERNET CONNECTION");
                Application.Quit();
            }
        }
    }
}