C# combobox options dependent on another combobox

Question

I am working on a program in which a combobox\'s options are dependent on another combobox\'s selected option. The selected item from the first combobox chooses which optio

Answer 1

Add a SelectedIndexChanged event handler for the first ComboBox. Use it to clear the content of the second ComboBox and populate it with the related items:

public Form1()
  {
    InitializeComponent();
    for(int i = 0; i < 10; i++) {
        comboBox1.Items.Add(String.Format("Item {0}", i.ToString()));
    }
    comboBox1.SelectedIndex = 0;
  }

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
  {
    comboBox2.Items.Clear();
    for (int i = 0; i < 5; i++)
    {
      comboBox2.Items.Add(String.Format("Item_{0}_{1}", 
                          comboBox1.SelectedItem, i.ToString()));
    }
    comboBox2.SelectedIndex = 0;
  }