public string CreateMahasiswa(Mahasiswa mhs)
        {
            string        msg    = "GAGAL";
            SqlConnection sqlcon = new SqlConnection("Data Source=LAPTOP-54NOARJ3;Initial Catalog=\"TI UMY\";Persist Security Info=True;User ID=sa;Password=123");
            string        query  = String.Format("insert into dbo.Mahasiswa values ('{0}', '{1}', '{2}', '{3}')", mhs.nama, mhs.nim, mhs.prodi, mhs.angkatan);
            SqlCommand    sqlcom = new SqlCommand(query, sqlcon);

            try
            {
                sqlcon.Open();
                Console.WriteLine(query);
                sqlcom.ExecuteNonQuery();
                sqlcon.Close();
                msg = "Sukses";
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(query);
                msg = "GAGAL";
            }

            return(msg);
        }