listBox selected item

Question

I have three listBoxes:

listBox1 have the following items: Fruit and vegetable.

listBox2 have the following items: Orange, Apple, cucumber and Tomato.

li

Answer 1

you can try

listBox1_SelectedIndexChanged(obj ... , sender e)
{
     if(listBox1.SelectedItem.ToString() == "Fruit")
     {
        listBox2.Items.Add("Orange");
        listBox2.Items.Add("Apple");
      }
     else if()
     {
        // other conditons
      }
}

listBox2_SelectedIndexChanged(obj ... , sender e)
{
     if(listBox2.SelectedItem.ToString() == "Apple")
     {
        listBox3.Items.Add("Red");
        listBox3.Items.Add("Green ");
      ........
      }
     else if()
     {
        // other conditons
      }
}

read http://msdn.microsoft.com/en-us/library/system.windows.forms.listbox.selectedindexchanged.aspx