How can I add an item from a listBox into a textBox

Question

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I would like to double click on an item in the list box and have that item show up in the textBox titled File name (please refer to the picture)

private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
{
  listBox1.Items.Add(textBox2.Text);
}

this code does not work, what am I doing wrong

You want the listbox to add the text in textbox in case of double-click on what? — user3165438, Aug 10 '14 at 08:58
I want to double click on an item in the listbox and have that name show up in the textbox. — Kiwilad, Aug 10 '14 at 09:00
See this: http://stackoverflow.com/questions/4454423/c-sharp-listbox-item-double-click-event — Marcel N., Aug 10 '14 at 09:00

score 2 · Accepted Answer · edited May 23 '17 at 11:49

2

You're doing it other way around. You try to add the text from textbox to listbox.

private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
{
    if(listBox1.SelectedItem != null)
    {
        textBox2.Text = listBox1.SelectedItem.ToString();
    }
}

To get more reliable results when clicking no item in listbox, you can use this answer. Thanks to @Marcel N.

edited May 23 '17 at 11:49

Community

1
1

answered Aug 10 '14 at 09:01

Sriram Sakthivel

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Doesn't always work. If you have an item already selected and double-click the blank are then you get a false hit. The answer in [this question](http://stackoverflow.com/questions/4454423/c-sharp-listbox-item-double-click-event) is more reliable in this regard. – Marcel N. Aug 10 '14 at 09:06
@MarcelN. I guess in that scenario `SelectedItem` will be set to null, so it won't result in false hit. – Sriram Sakthivel Aug 10 '14 at 09:09
@SriramSakthivel: It will not :). You can test it, it occurs consistently. – Marcel N. Aug 10 '14 at 09:09
@MarcelN. Yes you're right.. – Sriram Sakthivel Aug 10 '14 at 09:16
@SriramSakthivel: I guess it's not a big downside, especially for OP and the item does stay selected when double-clicking so it is not confusing. Something worth noting nonetheless. – Marcel N. Aug 10 '14 at 09:19

score 0 · Answer 2 · edited Aug 13 '14 at 18:48

Your code does not add any text to your textbox from your listbox. For your purpose you need to use this code:

private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
{
  textBox2.Text = listBox1.SelectedItem.ToString();
}

You don't need to use any if, because when you have some items in your listbox, you can just click or double click on them. When you don't have any items, you won't have any things to click, so null could never be returned. I tested it, and you can try too.

How can I add an item from a listBox into a textBox

2 Answers2