Distinct items from IEnumerable< T>

Question

I have an IEnumerable< Person> object. The Person class has a Designation proeprty.

I want to select distinct Designation values from IEnumerable< Person> and assign that to a DropDownList. How can I do it?

Answer 1

var designations = persons.Select(p => p.Designation).Distinct();

Answer 2

• Get every item
• Remove duplicates
• Add them to drop down list.

Or:

• Get item by item
• Check whethe ralready in list
• If not, add.

Basic programming.