how to change code to retrieve particular column in datagridview?

I have a list of data in datagridview. For example, one column is named Class (each row has a different value, see below), is it possble that to have a combo box, that contains all of the possible record Class values in the combo box? *It should be have a list of 6A, 6B, 6C If more classes are added to the database later (example 6D), these should also be in the combobox.*

A view of datagridview

Class              Name

6A                  Jane,14 May 1980;Mary,4 June 1980; 
6B                  leen, 31 May 1980; Peter 6 Jan 1980;
6C开发者_Go百科                  Eillen, 19 Aug 1980; Yvwon, 28 Mar 1980;
6D                  Evan, 24 Dec 1980; Ivan, 20 Nov 1980;

Here is the code i found, but how do I change it to what i want?

var input = Convert.ToString(datagridview1.CurrentRow.Cells[0].Value);
var resultList = Regex.Matches(input, **@".*?,(.*?),.*?;")**
    .Cast<Match>()
    .Select(arg => arg.Groups[1].Value)
    .ToList();



// bind to a combobox
comboBox1.DataSource = resultList;

If this is a Windows Forms app then you can create a class, similar to

class Obj {
    public string Class { get; set; }
    public string Data { get; set; }
}

then create a list of objects:

var list = new List<Obj>();
list.Add(new Obj() { Class = "6A", Data = "Jane,14 May 1980;Mary,4 June 1980;" });
// continue adding to the list here

and then

comboBox1.DataSource = list;
comboBox1.DisplayMember = "Class";

And finally hook your comboBox1.SelectedIndexChanged to an event and grab the comboBox1.SelectedItem, cast it to Obj and you're good.