How to increase control over SelectedIndexChanged lists in code?

Question

How to raise an asp.net list control's SelectedIndexChanged event in code using C #?

Answer 1

If you ask how to manually trigger an event so that it can fire any logic: not .

Event handlers must be subtle. If you need to perform one operation from several places, extract this functionality into your own method and call the event handler. For instance:

private void CountryListBox_SelectedIndexChanged(object sender, EventArgs e)
{
    UpdateStates(ListBox1.SelectedItem.Text);
}

private void UpdateStates(string country)
{
    StateListBox.DataSource = GetStates(country);
    StateListBox.DataBind();
}

Now, instead of triggering an event SelectedIndexChanged, you simply call the method this event handler belongs to, i.e.

private void Page_Load(object sender, EventArgs e)
{
    UpdateStates("USA");
}

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Answer 2

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protected void ListBox1_SelectedIndexChanged ( , EventArgs e)      {
     }

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ListBox1_SelectedIndexChanged (, );

Answer 3

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