Try something like this:
<script type="text/javascript">
function DeleteFunction(guid){
$.ajax({
type: "POST",
url: @Url.Action("Delete","Contact"),
data: JSON.stringify({contactId: guid}),
dataType: 'json',
contentType: 'application/json; charset=utf-8',
error: function (xhr) {
alert('Error: ' + xhr.statusText);
},
success: function (result) {
alert(result);
},
async: true,
processData: false
});
</script>
<a href="" onclick='DeleteFunction("@item.Id");'>Delete</a>