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    <p>ComboBox can autocomplete, but only one word at a time.</p> <p>If you want to have each word separately autocompleted, you have to write your own.</p> <p>I already did, hope it's not too long. It's not 100% exactly what you want, this was used for autocompleting in email client when typing in email adress.</p> <pre><code>/// &lt;summary&gt; /// Extended TextBox with smart auto-completion /// &lt;/summary&gt; public class TextBoxAC: TextBox { private List&lt;string&gt; completions = new List&lt;string&gt;(); private List&lt;string&gt; completionsLow = new List&lt;string&gt;(); private bool autocompleting = false; private bool acDisabled = true; private List&lt;string&gt; possibleCompletions = new List&lt;string&gt;(); private int currentCompletion = 0; /// &lt;summary&gt; /// Default constructor /// &lt;/summary&gt; public TextBoxAC() { this.TextChanged += new EventHandler(TextBoxAC_TextChanged); this.KeyPress += new KeyPressEventHandler(TextBoxAC_KeyPress); this.KeyDown += new KeyEventHandler(TextBoxAC_KeyDown); this.TabStop = true; } /// &lt;summary&gt; /// Sets autocompletion data, list of possible strings /// &lt;/summary&gt; /// &lt;param name="words"&gt;Completion words&lt;/param&gt; /// &lt;param name="wordsLow"&gt;Completion words in lowerCase&lt;/param&gt; public void SetAutoCompletion(List&lt;string&gt; words, List&lt;string&gt; wordsLow) { if (words == null || words.Count &lt; 1) { return; } this.completions = words; this.completionsLow = wordsLow; this.TabStop = false; } private void TextBoxAC_TextChanged(object sender, EventArgs e) { if (this.autocompleting || this.acDisabled) { return; } string text = this.Text; if (text.Length != this.SelectionStart) { return; } int pos = this.SelectionStart; string userPrefix = text.Substring(0, pos); int commaPos = userPrefix.LastIndexOf(","); if (commaPos == -1) { userPrefix = userPrefix.ToLower(); this.possibleCompletions.Clear(); int n = 0; foreach (string s in this.completionsLow) { if (s.StartsWith(userPrefix)) { this.possibleCompletions.Add(this.completions[n]); } n++; } if (this.possibleCompletions.Count &lt; 1) { return; } this.autocompleting = true; this.Text = this.possibleCompletions[0]; this.autocompleting = false; this.SelectionStart = pos; this.SelectionLength = this.Text.Length - pos; } else { string curUs = userPrefix.Substring(commaPos + 1); if (curUs.Trim().Length &lt; 1) { return; } string trimmed; curUs = this.trimOut(curUs, out trimmed); curUs = curUs.ToLower(); string oldUs = userPrefix.Substring(0, commaPos + 1); this.possibleCompletions.Clear(); int n = 0; foreach (string s in this.completionsLow) { if (s.StartsWith(curUs)) { this.possibleCompletions.Add(this.completions[n]); } n++; } if (this.possibleCompletions.Count &lt; 1) { return; } this.autocompleting = true; this.Text = oldUs + trimmed + this.possibleCompletions[0]; this.autocompleting = false; this.SelectionStart = pos; this.SelectionLength = this.Text.Length - pos + trimmed.Length; } this.currentCompletion = 0; } private void TextBoxAC_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Back || e.KeyCode == Keys.Delete) { this.acDisabled = true; } if (e.KeyCode == Keys.Up || e.KeyCode == Keys.Down) { if ((this.acDisabled) || (this.possibleCompletions.Count &lt; 1)) { return; } e.Handled = true; if (this.possibleCompletions.Count &lt; 2) { return; } switch (e.KeyCode) { case Keys.Up: this.currentCompletion--; if (this.currentCompletion &lt; 0) { this.currentCompletion = this.possibleCompletions.Count - 1; } break; case Keys.Down: this.currentCompletion++; if (this.currentCompletion &gt;= this.possibleCompletions.Count) { this.currentCompletion = 0; } break; } int pos = this.SelectionStart; string userPrefix = this.Text.Substring(0, pos); int commaPos = userPrefix.LastIndexOf(","); if (commaPos == -1) { pos--; userPrefix = this.Text.Substring(0, pos); this.autocompleting = true; this.Text = userPrefix + this.possibleCompletions[this.currentCompletion].Substring(userPrefix.Length); this.autocompleting = false; this.SelectionStart = pos + 1; this.SelectionLength = this.Text.Length - pos; } else { string curUs = userPrefix.Substring(commaPos + 1); if (curUs.Trim().Length &lt; 1) { return; } string trimmed; curUs = this.trimOut(curUs, out trimmed); curUs = curUs.ToLower(); string oldUs = userPrefix.Substring(0, commaPos + 1); this.autocompleting = true; this.Text = oldUs + trimmed + this.possibleCompletions[this.currentCompletion]; this.autocompleting = false; this.SelectionStart = pos; this.SelectionLength = this.Text.Length - pos + trimmed.Length; } } } private void TextBoxAC_KeyPress(object sender, KeyPressEventArgs e) { if (!Char.IsControl(e.KeyChar)) { this.acDisabled = false; } } private string trimOut(string toTrim, out string trim) { string ret = toTrim.TrimStart(); int pos = toTrim.IndexOf(ret); trim = toTrim.Substring(0, pos); return ret; } } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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