I can't seem to figure out how to just return all rows when using Select on a DataTable.

My code so far:

```
foreach (DataRow r in data.Select("Sort != null", "Sort"))
{ //process }

```

I get the following error:

> 
> Cannot interpret token '!'
> 
> 
> 

The ***Sort*** column is of type *Guid* and is used to return the rows in a random order.