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POHow do I make that the first item in ListBox will be selected automatically?
 

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  1. POHow do I make that the first item in ListBox will be selected automatically?
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    <p>I have a UserControl in a Form that contains a Listbox. I would like to automatically select the first item in the Listbox (assuming there is at least one item) but I cannot get the following code to work:</p> <pre><code>private void Lightnings_Mode_Load(object sender, EventArgs e) { this.Size = new Size(416, 506); this.Location = new Point(23, 258); listBoxIndexs(); listBoxControl1.MyListBox.SelectedIndex = 0; if (this.listBoxControl1.MyListBox.Items.Count &gt; 0) this.listBoxControl1.MyListBox.SelectedIndex = 0; listBoxControl1.MyListBox.SelectedIndexChanged += new EventHandler(listBox1_SelectedIndexChanged); this.listBoxControl1.ItemRemoved += new EventHandler&lt;ItemEventArgs&gt;(listBoxControl1_ItemRemoved); } </code></pre> <p>This line: listBoxControl1.MyListBox.SelectedIndex = 0; will mark the first ListBox item in blue like it is selected. But it's not realy selecting the item!</p> <p>So I tried to add this:</p> <pre><code>if (this.listBoxControl1.MyListBox.Items.Count &gt; 0) this.listBoxControl1.MyListBox.SelectedIndex = 0; </code></pre> <p>But it's not working either.</p> <p>This is the SelectedIndex event:</p> <pre><code>private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e) { item = listBoxControl1.MyListBox.SelectedItem.ToString(); this.f1.PlayLightnings(); f1.pdftoolsmenu(); int indx = listBoxControl1.MyListBox.SelectedIndex; if (listBoxControl1.Indices.Contains(indx)) { if (item != null &amp;&amp; !pdf1.Lightnings.Contains(item.ToString())) { pdf1.Lightnings.Add(item.ToString()); } } } </code></pre> <p>The name of the event is not right I have to change it since it's the ListBox over the UserControl but it's the right one.</p> <p>When I put a breakpoint in the SelectedIndex event and I click on an item, it stops at the breakpoint. But I want it to go to the selectedIndex event automatically once I show/open the new Form with the UserControl and the ListBox. </p> <p>So if I put a breakpoint in the SelectedIndex event, when I click the button in Form1 to show/open the new Form it will automatically stop in the breakpoint like I was clicking the first item.</p> <p>This is in Form1 the code that show the new Form:</p> <pre><code>if (toolStripComboBox2.SelectedIndex == -1 &amp;&amp; toolStripComboBox1.SelectedIndex == -1) { } else { Lightnings_Extractor.Lightnings_Mode lightningsmode1 = new Lightnings_Extractor.Lightnings_Mode(this); lightningsmode1.Show(); } </code></pre> <p>Everything is working except for selecting the first item automatically.</p>
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