using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["DataContext"].ConnectionString))
{
    con.Open();
    var sc = new SqlCommand("InsertOrUpdate", con);
    sc.CommandType = System.Data.CommandType.StoredProcedure;
    sc.Parameters.AddWithValue("code", "some string code");
    var o = sc.ExecuteScalar(); // is null. cannot step into
    int newPrimaryKey = Convert.ToInt32(o); // stays zero
}