Question

I have a ListBox in my webpage (I’m using ASP.NET Web Form 4) and when i want to Convert these ListBox’ Items to String Array it’s not working,
i use this code :

protected void btnSend_Click(object sender, EventArgs e)
{
    String[] a= ListBox1.Items.Cast<String>().ToArray();
}

when I click on btnSend and inspect it via Chrome Dev Tools (in the Console tab), I get an error like this:

Unable to cast object of type ‘System.Web.UI.WebControls.ListItem’ to type ‘System.String’

Why is this occurring and how can I fix it?

Answer 1

The ListBox.Items collection contain ListItems.

var texts = ListBox1.Items
    .Cast<ListItem>()
    .Select(item => item.Text)
    .ToArray();