How can I save any data on the server that I may collect on the client ?

First I create a new dataset from client :
<Client side>
<script type=text/javascript>

var ds1 = new Ajax.Web.DataSet();
var dt = new Ajax.Web.DataTable();

dt.addColumn("FirstName", "System.String");
dt.addColumn("Age", "System.Int32");

dt.addRow({"FirstName":"Michael","Age":28});
dt.addRow({"FirstName":"Tanja","Age":25});

ds1.addTable(dt);

</script>

How can I save this dataset on the server or change it to xml and send
to an URL?
Please help me!