<%@ Page Language="C#" %>
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
string[] CarArray = new string[4] {"Ford", "Honda", "BMW", "Dodge"};
string[] AirplaneArray = new string[3] {"Boeing 777", "Boeing 747","Boeing 737"};
string[] TrainArray = new string[3] {"Bullet Train", "Amtrack", "Tram"};
if (DropDownList1.SelectedValue == "Car") {
DropDownList2.DataSource = CarArray; }
else if (DropDownList1.SelectedValue == "Airplane") {
DropDownList2.DataSource = AirplaneArray; }
else {
DropDownList2.DataSource = TrainArray;
}
DropDownList2.DataBind();
DropDownList2.Visible = true;
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write("You selected " +
DropDownList1.SelectedValue.ToString() + ": " +
DropDownList2.SelectedValue.ToString() + "");
}
DropDownList Page
Select transportation type:
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
AutoPostBack="true">
Select an Item
Car
Airplane
Train