title: C# combobox selected index changed fires old value
body: <p>I have a situation when I want to change the selected value of a combo box in a windows forms application by using Ctrl-Left ori Ctrl-Right. However if the combobox is the selected control on the form this does not work. The selected value is set to the old value after it is set to the new value. If the combobox is not the selected control then everything works fine. In my application the combo can receive focus because the values can also be changed with the mouse. While what I want can be accomplished by selecting some other control on the form before actually changing the value I don't like this solution to much. </p>
  
  <p>So, there are two questions: Why is the selectedIndexChanged event fired with the old value if the combo box is the selected control on the form and 
  How can avoid this or if I can't what is a good workaround ? Further is some code to illustrate my issue. If you drop a combo box and a richtext box on a form and copy the below code in Form1.cs you can see my problem. You need to make the combo DropDownList Style and add some numbers as items (1, 2, 3 is fine)</p>
  
  <pre><code>public partial class Form1 : Form
  {
      public Form1()
      {
          InitializeComponent();
          comboBox1.SelectedIndex = 0;
      }
  
      protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
      {
          if (keyData == (Keys.Control | Keys.Left))
          {
              DoUpdate();
          }
          return base.ProcessCmdKey(ref msg, keyData);
      }
  
      private void DoUpdate()
      {
          int index = Convert.ToInt32(comboBox1.SelectedItem);
          index++;
          if (comboBox1.Focused)
              richTextBox1.Select();
          comboBox1.SelectedItem = index.ToString();
      }
  
      private void SetComboValue(int value)
      {
          comboBox1.SelectedItem = value.ToString();
          richTextBox1.AppendText(string.Format("Set value {0} \r\n", value.ToString()));         
      }
  
      private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
      {
          richTextBox1.AppendText(string.Format("Selected index changed before {0}\r\n", comboBox1.SelectedItem));
          SetComboValue(Convert.ToInt32(comboBox1.SelectedItem));
          richTextBox1.AppendText(string.Format("Selected index changed after {0}\r\n", comboBox1.SelectedItem));
      }
  }
  </code></pre>