A coworker showed me this:
He has a DropDownList and a button on a web page. Here's the code behind:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ListItem item = new ListItem("1");
item.Attributes.Add("title", "A");
ListItem item2 = new ListItem("2");
item2.Attributes.Add("title", "B");
DropDownList1.Items.AddRange(new[] {item, item2});
string s = DropDownList1.Items[0].Attributes["title"];
}
}
protected void Button1_Click(object sender, EventArgs e)
{
DropDownList1.Visible = !DropDownList1.Visible;
}
On the page load, the items' tooltips are showing, but on the first postback, the attributes are lost. Why is this the case, and are there any workarounds?