Convert Javascript to C#?

hi any help how to convert javascript to c#>

here is my javascript code
<script type = "text/javascript">
var counter = 0;
function AddFileUpload() {
var div = document.createElement('DIV');


div.innerHTML = 'Description' + '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;' +
'File' + '<br />' +
GetDynamicTextBox("") +'&nbsp; &nbsp;' +
'<input id="file' + counter + '" name = "file' + counter +
'" type="file" />' +
'<input id="Button' + counter + '" type="button" ' +
'value="Remove" onclick = "RemoveFileUpload(this)" />';

document.getElementById("FileUploadContainer").appendChild(div);
< ...