实现局域网计算机的搜索
代码：
 private void button3_Click(object sender, EventArgs e)
        {
            Thread thScan = new Thread(new ThreadStart(ScanTarget));
            thScan.Start();
        }
        private void ScanTarget()
        {
            string strIpAddress = numericUpDown1.Value + "." + numericUpDown2.Value + "." + numericUpDown3.Value + ".";
            int nStart = Int32.Parse(numericUpDown4.Value.ToString());
            int nEnd = Int32.Parse(numericUpDown5.Value.ToString());
            for (int i = nStart; i < nEnd; i++)
            {
                string strScanIpAdd = strIpAddress + i.ToString();
                IPAddress myScanIp = IPAddress.Parse(strScanIpAdd);
                try
                {
                    IPHostEntry myScanHost = Dns.GetHostEntry(myScanIp);
                    string strHostName = myScanHost.HostName.ToString();
                    //richTextBox3.AppendText(strScanIpAdd+" "+strHostName+"\r");
                    this.SetText(strScanIpAdd + " " + strHostName + "\r");
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }
        delegate void SetTextCallback(string text);
        private void SetText(string text)
        {
            if (richTextBox3.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {
                this.richTextBox3.AppendText(text);
            }
        }

运行时出错
[] = {"请求的名称有效并且在数据库中找到，但是它没有相关的正确的数据来被解析。"}

请问这是什么原因造成的 ？该如何解决？

[[it] 本帖最后由 Y08M09D26 于 2008-9-27 14:12 编辑 [/it]]

谢啦

出错是什么原因引起的啊  怎么解决啊

改了还是不行

出错提示：找不到这样的主机