Returns messages record exist or insert from MVC to Angular

Question

Dear all,

I am beginner in ASP .net MVC and Angular 5. I was trying to insert record using Angular 5 to MVC using API Controller.

 

Here is my TypeScript file code

saveStudent(Student){

   let headers = new Headers();
   headers.append('Content-Type', 'application/json');
   headers.append('Access-Control-Allow-Origin', '*');
   headers.append('Access-Control-Allow-Methods', 'GET, POST, PUT');
   return this.http.post(environment.apiUrl + 'Student', Student, { headers: headers })
     .pipe(map(data => data.json()),
     catchError((error: any) => {
       throw error;
   }));
 }

Above code get redirected to StudentController which is inherited from ApiController.

There is  post method which has return type of void as follows :-

 

public void Post([FromBody]Student value)
{
  _studentRepository.Post(value);
}

There is interface with name IStudentRepository which contains post as follows : - 

void Post(Student value);

There is StudentRepository which contains following :-

public void Post(Student objstudent)
        {
            string message = string.Empty;
            string query = "select count(*) from mststundent where StudentName = " + objclass.StudentName;
            MySqlConnection conn = new MySqlConnection(ConnStr);
            conn.Open();
            MySqlCommand objcmd = new MySqlCommand(query);
            int result = Convert.ToInt32(objcmd.ExecuteScalar());
            if (result > 0)
            {
                message = "Exist";
            }
            else
            {
                message = "Inserted";
            }
            conn.Close();
        }

what I want to do is return those messages.

Please let me anyone have easy solution.

Thanking You in adnavce.