Now the elements of enum `SortDirection` does not have int numbers:

```csharp

public enum SortDirection

{     Ascending,     Descending }

```

Because of this, a lot of logic in the code of `MongoDB.Driver` library to verify compliance with the elements and numbers (-1 and 1) like this:

```csharp

switch (_direction)

{     case SortDirection.Ascending:         value = 1;         break;     case SortDirection.Descending:         value = -1;         break;     default:         throw new InvalidOperationException("Unknown value for " + typeof(SortDirection) + "."); }

```

This is unnecessary logic, because the C# has built-in casting enum to Int32 via setting numbers for appropriate enum elements. So the enum `SortDirection` might be refactored like this:

```csharp

public enum SortDirection

{     Ascending = 1,     Descending = -1 }

```

In this case no more additional logic needed. And in the future, if this numbers will be changed (for example, `100` for `Ascending` and `200` for `Descending`), there is one place to change code - `SortDirection` enum.

Any string representation of `SortDirection` enum elements looks like this:

```csharp

$"ascending is: {(int) SortDirection.Ascending}"

```