Dropdownlist selected value at Selectedindexchanged event

Question

I'm working on asp.net website with Vb.net and I have a dropdownlist with autopostback = true and I need to get the selected value when I change the item or I want to get the item which fires the selectedindexchanged event ..

any help please..

Nozzle

Answer 1

In ie. your Page_Load set

this.ComboBox1.SelectedIndexChanged += new System.EventHandler(ComboBox1_SelectedIndexChanged);

Then write the event handler like this:

private void ComboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
  ComboBox comboBox = (ComboBox) sender;
  string selected = (string) comboBox.SelectedItem;
}

Make sure that in your Page_Load you write this before setting the combobox default value or you will end up with this always being the selected item:

if (Page.IsPostBack)
  return;

Doghouse

I edited my answer, you need to be aware that the Page_Load is executed before the SelectedIndexChanged, so anything you do with the combobox here will affect your result. Use the if statement in the top section of Page_Load. – Doghouse

shouldn't this: ComboBox1.SelectedItem; be this: comboBox.SelectedItem; ? – Salita

It's amazing how the OP specified in the question that he's working on a asp.net website with Vb.net but all the answers on here are C#?? lol – Deadlight

Answer 2

try this:

    protected void list_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList list = (DropDownList)sender;
        string value = (string)list.SelectedValue;
    }

Chenopod

This gives me a SelectedValue of whatever the Initial setting is rather than the newly selected setting. – Flavine

Answer 3

If item is a Dictionary:

string value = ((KeyValuePair<string, string>)combobox.SelectedItem).Key;

Reface