This code is written in ComboBox KeyUp event as we have tocheck after every new character is typed.
private void comboBox1_KeyUp(objectsender, KeyEventArgs e)
// Donothing for certain keys, such as navigation keys.
if((e.KeyCode == Keys.Back) ||
(e.KeyCode == Keys.Left) ||
(e.KeyCode == Keys.Right) ||
(e.KeyCode == Keys.Up) ||
(e.KeyCode == Keys.Down) ||
(e.KeyCode == Keys.Delete) ||
(e.KeyCode == Keys.PageUp) ||
(e.KeyCode == Keys.PageDown) ||
(e.KeyCode == Keys.Home) ||
(e.KeyCode == Keys.End))
// Storethe actual text that has been typed.
actual = this.comboBox1.Text;
// Findthe first match for the typed value.
index = this.comboBox1.FindString(actual);
// Getthe text of the first match.
if(index > -1)
found = this.comboBox1.Items[index].ToString();
//Select this item from the list.
//Select the portion of the text that was automatically
//added so that additional typing replaces it.