error while sending post request in angular

Question

hi,

 

i am getting 500 internal server error on using below angular script in dot net pleae help

 

 

$scope.Delete = function (SID) {

if (confirm("Are you sure want to delete?")) {
var httpreq = {
method: 'POST',
url: 'default.aspx/Delete',
headers: {
'Content-Type': 'application/json; charset=utf-8',
'dataType': 'json'
},
data: { StudentID: SID }
}