asp.net in asp.net 2.0, you can hide an item in the ListBox, such as
ListItem item = new ListItem (text, value, enabled);
Of course, you can also use
Item. Enabled = false;
Although hidden in the page, but still can use code to access the hidden options, the following is an example
<%@ Page language= "C #"%>
<script runat= "Server" >
protected void Page_Load (object sender, EventArgs e)
{
if (! Page.IsPostBack)
{
listitem[] items = new listitem[]
{
New ListItem ("Item 1", "Value 1"),
New ListItem ("Item 2", "Value 2", false),
New ListItem ("Item 3", "Value 3"),
New ListItem ("Item 4", "Value 4")
};
ListBox1.Items.AddRange (Items);
}
}
protected void Button1_Click (object sender, EventArgs e)
{
foreach (ListItem item in Listbox1.items)
{
Response.Write (item. Text + "enabled=" + item. Enabled + "<br>");
}
}
</script>
<title>untitled page</title>
<body>
<form id= "Form1" runat= "Server" >
<div>
<asp:listbox id= "ListBox1" runat= "Server"/>
<asp:button id= "Button1" runat= "Server" text= "button" onclick= "Button1_Click"/></div>
</form>
</body>
