Handle the SelectedIndexChanged
event for the first ComboBox
, then update the second combo box based on the SelectedItem
value for the first ComboBox
.
A quick example (sans error handling when retrieving the SelectedItem):
public partial class Form1 : Form
{
private string[] comboBox1Range = new[] { "A", "B", "C", "D" };
private string[] comboBox2RangeA = new[] { "A1", "A2", "A3", "A4" };
private string[] comboBox2RangeB = new[] { "B1", "B2", "B3", "B4" };
private string[] comboBox2RangeC = new[] { "C1", "C2", "C3", "C4" };
private string[] comboBox2RangeD = new[] { "D1", "D2", "D3", "D4" };
public Form1()
{
InitializeComponent();
comboBox1.SelectedIndexChanged += comboBox1_SelectedIndexChanged;
comboBox1.Items.AddRange(comboBox1Range);
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedValue = comboBox1.SelectedItem as string;
switch (selectedValue)
{
case "A":
comboBox2.Items.Clear();
comboBox2.Items.AddRange(comboBox2RangeA);
break;
case "B":
comboBox2.Items.Clear();
comboBox2.Items.AddRange(comboBox2RangeB);
break;
case "C":
comboBox2.Items.Clear();
comboBox2.Items.AddRange(comboBox2RangeC);
break;
case "D":
comboBox2.Items.Clear();
comboBox2.Items.AddRange(comboBox2RangeD);
break;
}
}
}
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