C#

<br />
//************************************************************************************<br />
		//   Call the corresponding functions from your form's Combobox's KeyUp and<br />
		//   Leave events<br />
		//************************************************************************************<br />
		private void ACCombo_KeyUp(ComboBox cbo, KeyEventArgs e)<br />
		{<br />
			//Allow select keys without autocompleting<br />
			switch(e.KeyCode)<br />
			{<br />
				case Keys.Back:<br />
				case Keys.Left:<br />
				case Keys.Right:<br />
				case Keys.Up:<br />
				case Keys.Delete:<br />
				case Keys.Down:<br />
					return;<br />
			}<br />
<br />
			//Get the typed text and find it on the list<br />
			string strTypedText = cbo.Text;<br />
			int intFoundIdx = cbo.FindString(strTypedText);<br />
<br />
			//If we found the typed text in the list then autocomplete<br />
			if(intFoundIdx >= 0)<br />
			{<br />
				//Get the item from the list (Return type depends if datasource was bound<br />
				//or list created)<br />
				object objFoundItem = cbo.Items[intFoundIdx];<br />
<br />
				//Use the listcontrolgetitemtext to resolve the name in case the combo <br />
				//was data bound<br />
				string strFoundText = cbo.GetItemText(objFoundItem);<br />
<br />
				//Append then found text to the typed text to preserve case<br />
				string strAppendText = strFoundText.Substring(strTypedText.Length);<br />
				cbo.Text = strTypedText + strAppendText;<br />
<br />
				//Select the appended text<br />
				cbo.SelectionStart = strTypedText.Length;<br />
				cbo.SelectionLength = strAppendText.Length;<br />
			}<br />
		}<br />
<br />
		private void ACCombo_Leave(ComboBox cbo)<br />
		{<br />
			int intFoundIdx = cbo.FindStringExact(cbo.Text);<br />
			cbo.SelectedIndex = intFoundIdx;<br />
		}<br />

Page_Load:<br />
<br />
if(!IsPostBack){<br />
  BindData();<br />
}