You will need to use a custom auto-complete source to do this. Adding to your example, you can do something like the following :
AutoCompleteStringCollection coll = new AutoCompleteStringCollection();
coll.AddRange(
new string[] { “100”, “120”, “200”, ” 220″ } );
winComboBox1.TextBoxArea.AutoCompleteMode =
AutoCompleteMode.Append;
//or, depending on how you want to display the suggested items, you can use the following instead
winComboBox1.TextBoxArea.AutoCompleteMode =
AutoCompleteMode.SuggestAppend;
winComboBox1.TextBoxArea.AutoCompleteSource =
AutoCompleteSource.CustomSource;
winComboBox1.TextBoxArea.AutoCompleteCustomSource = coll;
Imported from legacy forums. Posted by André (had 3471 views)