public string CreateMahasiswa(Mahasiswa mhs) { string msg = "GAGAL"; string query = String.Format("insert into dbo.Mahasiswa values ('{0}','{1}','{2}','{3}')", mhs.nim, mhs.nama, mhs.prodi, mhs.angkatan); SqlCommand cmd = new SqlCommand(query, con); try { con.Open(); Console.WriteLine(query); cmd.ExecuteNonQuery(); con.Close(); msg = "Sukses"; } catch (Exception ex) { Console.WriteLine(ex.Message); Console.WriteLine(query); msg = "GAGAL"; } return(msg); }