C# 指定ip段生成ip地址

private void button1_Click(object sender, EventArgs e)
        {
            string StartIp = "";
            string EndIp = "";
            StartIp = Startinput.Text;
            EndIp = Endinput.Text;
            uint iStartip = ipTint(StartIp);
            uint iEndIp = ipTint(EndIp);
            //string ip_result="";
            StringBuilder ip_result=new StringBuilder();
            if (iEndIp >= iStartip)
            {
                for (uint ip = iStartip; ip <= iEndIp; ip++)
                {
                    ip_result.Append(intTip(ip)).Append("\r\n");
                    //ip_result = ip_result + intTip(ip)+"\r\n";
                }
                resultTextBox.Text = ip_result.ToString();   //RichTextBox
            }
            else
            {
                MessageBox.Show("天啊，起始ip居然比终止ip还大");
            }
        }
        public static uint ipTint(string ipStr)
        {
            string[] ip = ipStr.Split(‘.‘);
            uint ipcode = 0xFFFFFF00 | byte.Parse(ip[3]);
            ipcode = ipcode & 0xFFFF00FF | (uint.Parse(ip[2]) << 0x8);
            ipcode = ipcode & 0xFF00FFFF | (uint.Parse(ip[1]) << 0xF);
            ipcode = ipcode & 0x00FFFFFF | (uint.Parse(ip[0]) << 0x18);
            return ipcode;
        }
        public static string intTip(uint ipcode)
        {
            byte a = (byte)((ipcode & 0xFF000000) >> 0x18);
            byte b = (byte)((ipcode & 0x00FF0000) >> 0xF);
            byte c = (byte)((ipcode & 0x0000FF00) >> 0x8);
            byte d = (byte)(ipcode & 0x000000FF);
            string ipStr = string.Format("{0}.{1}.{2}.{3}", a, b, c, d);
            return ipStr;
        }