I have a table in my sql that have names and cities for example.

I want to make a Select Command that get all the cities and remove from the result the duplicates.

for the select i am using:

```
        string citiesSelect = "SELECT [city] FROM [people] ORDER BY [city]";
        CitiesDataSource.SelectCommand = citiesSelect;
        CitiesDataSource.Select(DataSourceSelectArguments.Empty);
        DropDownList2.DataSourceID = CitiesDataSource.ID;

```