IEqualityComparer GetHashCode

Question

I need to create a Distinct class for a LINQ query. Let's say the Department DTO class looks like this:

public class Department
{
    public int ID {get; set;} //primary key
    public string Name {get; set;}
    public string Address {get; set;}
}

and I need to query by distinct department names (not IDs). Will my GetHashCode look like

public int GetHashCode(Department record)
{
    return record.NAME.GetHashCode();
}

or will it look like

public int GetHashCode(Department record)
{
    return record.ID.GetHashCode();
}