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ademmeda
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C# Update ListBox2 When ListBox1 items are selected.

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Hi,

I have two listboxes on my form and I want to update listbox2 whenever an iem in listbox1 is clicked. For example,

Listbox1 will have category names like countries; USA, Canada, UK, France and so on. And Listbox 2 will have city names for each country. I started with something like

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if ( (string)listBox1.SelectedItem == "USA" )
            {
                listBox2.Items = "New York, Houston, Boston";

            }
            else if ((string)listBox2.SelectedItem == "UK")
            {
                listBox2.Items = "London, Manchaster";
            }


I don't know what to write instead of "listbox2.items". Any ideas?

c#, listview
  • asked one year ago
(x)
ademmeda
108

EDIT: listBox2 should be listBox1 in the above code, I mistyped it. "else if ((string)listBox2.SelectedItem == "UK")"

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last answered one year ago

1 answers

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Something like this should work:

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (listBox1.SelectedIndex > -1)
    {
        string[] cities = null;
        listBox2.Items.Clear();

        switch(listBox1.SelectedItem.ToString())
        {
            case "USA":
               cities = new string[]{"New York", "Houston", "Boston"};
               listBox2.Items.AddRange(cities);
               return;
            case "Canada":
               cities = new string[]{"Ottawa", "Montreal", "Toronto"};
               listBox2.Items.AddRange(cities);
               return;
            case "UK":
               cities = new string[]{"London", "Manchester", "Birmingham"};
               listBox2.Items.AddRange(cities);
               return;
        }
    }
}

  • answered one year ago by:

    vulpes
    17279
(x)
ademmeda
108

Well, that did what I needed, thank you very much.

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