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strResult = oBao.responseText;
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function ValidationFunctionName(source, arguments)
{
     var userName =document.getElementById("UserName");
     var oBao = new ActiveXObject("Microsoft.XMLHTTP");
        oBao.open("Get","Check.aspx?username=" + userName.value,false);  
        oBao.send();
     var strResult = oBao.responseText;
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     if (Number(strResult) == 1)
            arguments.IsValid = true;    
     else
            arguments.IsValid = false;
}
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