title: C# ComboBox SelectedIndex is always at 0 once Items are added
body: <p><strong>EDIT</strong> This has nothing to do with SelectedIndex property... If the default combobox text is "ABCD" and there's an item that starts with "ABCD", the combobox will find that item and select it.
  How do I prevent that from happening?</p>
  
  <p><strong>Original</strong></p>
  
  <p>When I click <code>ComboBox1</code> (Windows Forms - Visual Studio), the system will search the database for information to insert into a <code>ComboBox</code> (<code>string[,] Intel</code> is where this information is stored). Before the <code>Click</code> event is called, the <code>ComboBox</code> is with <code>SelectedIndex = -1</code>. This is how it adds Intel into this specific combobox:</p>
  
  <pre><code>for (int Dim1 = 0; Dim1 &lt; Intel.GetLength(0); Dim1++)
  {
      ComboBox1.Items.Add(Intel[Dim1, 1]);
  }
  </code></pre>
  
  <p>My problem is: Once I add the first item, <code>ComboBox1.SelectedIndex</code> is set to <code>0</code>. Even if I use <code>ComboBox1.SelectedIndex = -1;</code>, it still assumes it as <code>0</code>. Same with <code>ComboBox1.SelectedValue = null;</code> or <code>ComboBox1.Text = null;</code>. By <code>TextBox1.Text = ComboBox1.SelectedIndex;</code>, <code>TextBox1.Text</code> will display <code>-1</code>.</p>
  
  <p>I've done this with another ComboBox, and it works... It does set the selectedindex at -1, and the user will see the default text I want, which is not included in the items - and it can't. So, I'm thinking this must be some property I've set wrong.</p>