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<%@ Page Language="C#" %>
<script runat="server">
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 <b>" +
DropDownList1.SelectedValue.ToString() + ": " +
DropDownList2.SelectedValue.ToString() + "</b>");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>DropDownList Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Select transportation type:<br />
<asp:DropDownList ID="DropDownList1"
Runat="server"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
AutoPostBack="true">
<asp:ListItem>Select an Item</asp:ListItem>
<asp:ListItem>Car</asp:ListItem>
<asp:ListItem>Airplane</asp:ListItem>
<asp:ListItem>Train</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" Runat="server" Visible="false">
</asp:DropDownList>
<asp:Button ID="Button1" Runat="server" Text="Select Options"
OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
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