<script type="text/javascript">
        function copyToClipboard() 
        {
            var d = document.all("Uri").value;
            window.clipboardData.setData('text', d);
            alert("文章地址已经复制!");
        }   
</script> 
<button  onclick= "copyToClipboard();">拷贝</button> 
<input  type="text" id="source" value= ""/>

string url = Request.Url.AbsoluteUri;
this.Uri.value = url;