ListBox SelectedItems to MessageBox

Question

I have little problem with show string in MessageBox. I load date from database into ListBox.

Now I want show selecteditem. I have something like this:

StringBuilder message = new StringBuilder();
foreach (var selectedItem in CategorylistBox.SelectedValue.ToString())
{
    message.AppendLine(selectedItem.ToString());
}
MessageBox.Show(message.ToString());

I select "Sci-Fi" movie category, but I get:

http://prnt.sc/dvmfyl

Can someone help me and tell how to display it in one line?

Answer 1

On AddMovieClick please comment every thing else and test this one it will show you current items selected .

if (CategorylistBox.SelectedItems != null)
{
    foreach (var item in CategorylistBox.SelectedItem.ToString())
    {
        Debug.WriteLine("current item "+item);
        // CinemaDataSetTableAdapters.QueriesTableAdapter kTyp = new CinemaDataSetTableAdapters.QueriesTableAdapter();
        // kTyp.AddCategoryType((selectedItem), TitleTextBox.Text);
    }
}