listbox control in window application

Question

i have listbox control and i have to display selected item in the listbox.

some one send the code. the code like below

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
   textBox1.Clear();
   foreach (object selectedItem in listBox1.SelectedItems)
   {
      textBox1.AppendText(selectedItem.ToString() + Environment.NewLine);
   }
}

but it is giving errow at foreach please help me

Answer 1

EDIT: The code you posted does not crash for me. The comment on this answer is correct, SelectedItems is empty, but not null, if no item is selected. Did you leave out some of the code to simplify things?

Check whether listBox1.SelectedItems is null first.

private void listBox1_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    textBox1.Clear(); 

    if (listBox1.SelectedItems != null)
    {
        foreach (object selectedItem in listBox1.SelectedItems) 
        { 
            textBox1.AppendText(selectedItem.ToString() + Environment.NewLine); 
        } 
    }
}

Answer 2

Try foreach(object o in this.listBox1.SelectedItems) { aa.Add(selectedItem); }

Answer 3

There is not enough information here to answer the question, please post a sample of the error message you receive