[Solved] Using combo box in c# [closed]

Question

Well, i ll try to give you a quick example in Windows Forms.

Like you said, you got 2 combo boxes Category and Brand, i named cmbParent and cmbChild.

I declared some variables:

List<String> listParent = new List<String>();
List<Tuple<String, String>> listChild = new List<Tuple<String,String>>();

On Form_Load, i did some manual lists:

public ComboForm()
    {
        InitializeComponent();

        listParent.Add("Sports");
        listParent.Add("Countries");
        listParent.Add("Continents");

        listChild.Add(new Tuple<String, String>("Sports", "Handball"));
        listChild.Add(new Tuple<String, String>("Sports", "Golf"));
        listChild.Add(new Tuple<String, String>("Sports", "Skimboarding"));

        listChild.Add(new Tuple<String, String>("Countries", "Portugal"));
        listChild.Add(new Tuple<String, String>("Countries", "Mozambique"));
        listChild.Add(new Tuple<String, String>("Countries", "Mexico"));

        listChild.Add(new Tuple<String, String>("Continents", "Asia"));
        listChild.Add(new Tuple<String, String>("Continents", "Oceania"));

        foreach (var item in listParent)
        {
            cmbParent.Items.Add(item);
        }
    }

And added an event on the cmbParent, when you change the selected item, it will change the cmbChild.

private void cmbParent_SelectedIndexChanged(object sender, EventArgs e)
    {
        String i = cmbParent.Text;
        cmbChild.Items.Clear(); //clear the child combo items.
        foreach (var item in listChild)
        {
            if (item.Item1.Equals(i))
            {
                cmbChild.Items.Add(item.Item2);
            }
        }
    }

I hope this helps, and give you an hint.

Accepted Answer