protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            var sqlConnectionStringBuilder = new SqlConnectionStringBuilder
            {
                DataSource     = "10.0.2.229",
                InitialCatalog = "Heap_Record",
                UserID         = "sa",
                Password       = "******"
            };

            optionsBuilder.UseSqlServer(sqlConnectionStringBuilder.ConnectionString);
            optionsBuilder.EnableWithChangeTracingContext();

            base.OnConfiguring(optionsBuilder);
        }