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    <p>Made some sample code that might help - you can use as a guide.</p> <p>The idea is to handle the <code>TextChanged</code> event of the <code>ComboBox</code>, and really just modify the <code>ComboBox list items</code> at that point. The example below will modify the list to add the current text (most important, as this will not change the text when you click the combobox) and any other items that meet the search criteria.</p> <p>I don't think you need the code to re-initialize the list items when focus is lost, but left in there just in case.</p> <pre><code> //contains a list of default items for the combobox items List&lt;string&gt; comboList = new List&lt;string&gt;(); public Form1() { InitializeComponent(); initComboList(); //initialize the defaults initCombobox(); //initialize the combobox list items } //fills the defaults for the combobox items private void initComboList() { comboList.Add("red"); comboList.Add("blue"); comboList.Add("green"); } //initializes the combobox items private void initCombobox() { comboBox1.Items.Clear(); foreach (string s in comboList) comboBox1.Items.Add(s); } //occurs when the text changes in the combobox private void comboBox1_TextChanged(object sender, EventArgs e) { string curtext = comboBox1.Text; insertIntoComboBox(curtext); //insert the current text into combobox comboBox1.Select(curtext.Length, 0); //if you don't do this, the cursor goes back to index 0 :-( } //called whenever is desired to insert the current text into the combobox items private void insertIntoComboBox(string curtext) { comboBox1.Items.Clear(); //only add the current text if it's not already in the list of defaults and not empty string if (comboList.Contains(curtext) == false &amp;&amp; curtext.Length &gt; 0) comboBox1.Items.Add(curtext); foreach (string s in comboList) comboBox1.Items.Add(s); } //called whenever combobox loses focus private void comboBox1_Leave(object sender, EventArgs e) { initCombobox(); } </code></pre>
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    1. POHow can I prevent auto-select in ComboBox on drop-down except for exact matches?
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    1. POHow can I prevent auto-select in ComboBox on drop-down except for exact matches?
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    1. COI appreciate the suggestion, but I would really prefer to prevent the matching altogether, thus leaving my list intact and unmodified. My users expect a consistent list of choices, as it is taken from a government standard list. Unfortunately, this method would make for a constantly changing and unpredictable list.
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    2. COOK, understood. Based on your comment reply to John Willemse, the drop down list items are not the only items that are valid, correct? Is there any reason your are not filling the combobox with the list of ALL items that are valid?
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    3. COThe list consists of stock choices provided by the government. Users can use their own text, however. I cannot pre-populate simply because I can't predict all of the possibilities. There are likely hundreds, maybe over a 1000 possibilities/variations. Therefore, I need a simplistic approach: provide what stock options I know of, and allow entry of all else. The drop-down behavior is bad because it changes the selected value automatically. If I type "KG" (which is not stock), then opening the drop-down is enough to change my selection...I don't actually have to click a choice.
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