列表项Selected属性未触发点击事件处理程序

Question

I have two dropdown lists, ddlPrimarySeries and ddlSecondarySeries . I also have a button ( ImgBtnSeriesReversal ) in the middle of these dropdown lists that switches the selected values in the dropdown. This is the code that switches the selected items on the button click:

foreach (ListItem item in ddlPrimarySeries.Items)
{
    if (Convert.ToInt32(item.Value) == intSecondarySeries)
    {
        item.Selected = true;
        break;
    }
}

foreach (ListItem item in ddlSecondarySeries.Items)
{
    if (Convert.ToInt32(item.Value) == intPrimarySeries)
    {
        item.Selected = true;
        break;
    }
}

It loops through the list items and sees if the currently iterated item is equal to the selected item in the other dropdown and if so it selects it with item.Selected = true and then breaks. My issue is that when the values switch in the dropdowns the ddlPrimarySeries_SelectedIndexChanged and ddlSecondarySeries_SelectedIndexChanged events don't get fired. How can I accomplish this and have the event handlers fire when the values change?

Answer 1

foreach (ListItem item in ddlPrimarySeries.Items)
{
    if (Convert.ToInt32(item.Value) == intSecondarySeries)
    {
        item.Selected = true;
        break;
    }
}
***ddlPrimarySeries_SelectedIndexChanged(new object(), new EventArgs());***
foreach (ListItem item in ddlSecondarySeries.Items)
{
    if (Convert.ToInt32(item.Value) == intPrimarySeries)
    {
        item.Selected = true;
        break;
    }
}
***ddlSecondarySeries_SelectedIndexChanged(new object(), new EventArgs());***

Answer 2

Check that you have AutoPostBack set to true for the dropdown lists. By default it is false.