<div id="divFile">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" Style="width: 200px;" />
<asp:LinkButton ID="lnkAddFiles" runat="server" OnClientClick="return AddFile()">Add</asp:LinkButton>
</div>
</div>
<script type="text/javascript">
var i = 1;
function AddFile() {
i++;
var div = document.createElement('DIV');
div.innerHTML = '<input id="file' + i + '" name="file' + i + '" type="file" style="margin-bottom:10px;width:200px;" /><a href="#" style="font-weight:bold; margin-left:10px;" onclick="return RemoveFile(this)">Remove</a>';
document.getElementById("divFile").appendChild(div);
return false;
}
function RemoveFile(file) {
document.getElementById("divFile").removeChild(file.parentNode);
return false;
}
</script>
Use the above design and javascript. it may use full to you.