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C# asp.net macaddr

<HTML><HEAD><TITLE>WMI Scripting HTML</TITLE>
<META http-equiv=Content-Type c>
<SCRIPT language=JScript event="OnCompleted(hResult,pErrorObject, pAsyncContext)" for=foo>
var MACaddress=unescape(MACAddr);
alert(MACaddress);
document.forms[0].txtMACAddr.value=unescape(MACAddr);
//document.formbar.submit();
  </SCRIPT>
<META c name=GENERATOR></HEAD>
<BODY>
<SCRIPT language=JScript event=OnObjectReady(objObject,objAsyncContext) for=foo>
    if(objObject.IPEnabled != null && objObject.IPEnabled != "undefined" && objObject.IPEnabled == true){
        if(objObject.MACAddress != null && objObject.MACAddress != "undefined")
        MACAddr = objObject.MACAddress;
    }
  </SCRIPT>
<OBJECT id=locator classid=CLSID:76A64158-CB41-11D1-8B02-00600806D9B6 VIEWASTEXT></OBJECT>
<OBJECT id=foo classid=CLSID:75718C9A-F029-11d1-A1AC-00C04FB6C223></OBJECT>
<SCRIPT language=JScript>
   var service = locator.ConnectServer();
   var MACAddr ;
   service.Security_.ImpersonationLevel=3;
   service.InstancesOfAsync(foo, 'Win32_NetworkAdapterConfiguration'); 
   </SCRIPT>
<FORM id="formfoo" name="formbar" method="post"><INPUT value="77" name="txtMACAddr">
</FORM></BODY></HTML>


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private void CreateCheckCodeImage()
{
//»ñÈ¡Ëæ¼´×Ö·û´®
int number;
char code;
string checkCode = String.Empty;
System.Random random1 = new Random();
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