C# - On double click on listbox item

Question

I have a ListBox containing two items:

Item1 Item2

If I double click on Item1 a message should pop up with the text "Hello!". If I double click Item2 a message should pop up with the text "Bye!".

Whith the code below I'm obviously doing something wrong...

private void ListBox_DoubleClick(object sender, EventArgs e)
{

if (ListBox.SelectedIndex = 1)
{
MessageBox.Show("Hello!");
}

if (ListBox.SelectedIndex = 2)
{
MessageBox.Show("Bye!");
}

}

ema · Accepted Answer · 2017-01-06 06:57:34Z

3

Two things:

Lists and arrays are zero based so you should check for index 0 and

= is an assignment, you should use == in if statements

private void ListBox_DoubleClick(object sender, EventArgs e)
{

  if (ListBox.SelectedIndex == 0)
  {
     MessageBox.Show("Hello!");
  }

  if (ListBox.SelectedIndex == 1)  
  {
    MessageBox.Show("Bye!");
  }

}

edited Jan 6, 2017 at 6:57

answered Jan 6, 2017 at 6:51

ema

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Comments

David Pilkington · Accepted Answer · 2017-01-06 06:59:00Z

1

Use a zero based index

private void ListBox_DoubleClick(object sender, EventArgs e)
{

  if (ListBox.SelectedIndex == 0)
  {
    MessageBox.Show("Hello!");
  }

  if (ListBox.SelectedIndex == 1)
  {
    MessageBox.Show("Bye!");
  }  
}

edited Jan 6, 2017 at 6:59

answered Jan 6, 2017 at 6:49

David Pilkington

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