Save Web Service method name is not valid - asp.net

Question

I Create a Form in Asp.net Web App using angular js and I create save Form Data in database functionality using Asmx file But when I click on save Button the error will occure in console
This Error will be occure when i click submit button
This is My StudentService.Asmx file code
public class StudentService : System.Web.Services.WebService
{
[WebMethod]
public void Save(Student emp)
{
string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
using (SqlConnection con = new SqlConnection(cs))
{
SqlCommand cmd = new SqlCommand("sp_GetAllEmployee", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter()
{
ParameterName = "#FirstName",
Value = emp.FirstName
});
cmd.Parameters.Add(new SqlParameter()
{
ParameterName = "#LastName",
Value = emp.LastName
});
cmd.Parameters.Add(new SqlParameter()
{
ParameterName = "#Gender",
Value = emp.Gender
});
cmd.Parameters.Add(new SqlParameter()
{
ParameterName = "#TraningType",
Value = emp.TraningType
});
con.Open();
cmd.ExecuteNonQuery();
}
}
This Is my Angular Js Code
/// <reference path="angular.js" />
var MyApp = angular.module("Test", []).controller("MyController", function ($scope, $http) {
$scope.Save = function () {
$http.post("StudentService.asmx/Save")
.then(function (response) {
$scope.Student = response.data;
});
}
});