C#: Real-time combobox updating

Question

Edit: Alright, just one more thing: "It will only update the first character I change. So if I use backspace anywhere, it updates, and then I have to restart before it will update again. Also, it will go to the far left of the combobox line, which can be pretty annoying.. If anyone knows how to fix that too, I'd be really gratefull."

I am currently using this code:

private void comboBox1_TextChanged(object sender, EventArgs e) 
{ 
    if(comboBox1.SelectedIndex>=0) 
    { 
        int index = comboBox1.SelectedIndex; 
        comboBox1.Items[index] = comboBox1.Text; 
    } 

} 

Answer 1

What if you create a property in code-behind and bind to that property?

First win is better debuggability, second win is that you can decide what to do when getting / setting the data.

Answer 2

ComboBox.Update method just redraws the combobox area. As I understood, you want to change the combobox selected item in runtime. In that case you might want to use TextUpdate event. Combobox selected index is automatically stops the editing. So there is another way. Tracking of the value changing. Here is a code snippet:

    private int editedIndex = -1;
    private String editString = "";
    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (editedIndex == comboBox1.SelectedIndex) return;
        if(editedIndex>0) comboBox1.Items[editedIndex] = editString; //Change the previous item
        if(comboBox1.SelectedIndex>=0)         //get new item parameters
        {
            editedIndex = comboBox1.SelectedIndex;
            editString = comboBox1.Items[editedIndex].ToString();
        }
    }


    private void comboBox1_Leave(object sender, EventArgs e)
    {
        if(editedIndex>=0)
            comboBox1.Items[editedIndex] = editString;
    }

    private void comboBox1_TextUpdate(object sender, EventArgs e)
    {
        if (editedIndex >= 0)
        {
            editString = comboBox1.Text;
        }
    }

    private void comboBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if(e.KeyData==Keys.Enter&&editedIndex>=0)
            comboBox1.Items[editedIndex] = editString;
    }