Combo box to upper case

Question

I would like to have the characters in a combo box converted to upper case as the user types them. So for instance, when a user types 'a' in the text area, it would be converted to 'A'.

I've tried:

private void cmbList_KeyDown(object sender, KeyEventArgs e)
{
cmbList.Text.ToUpper();
}

Also, is there a way to have the drop down list 'drop' when any character is entered in the text area?

Mike Gold · Answer

You need to override the ComboBox. Here is the solution. After you build it it will show up in the toolbox and you can drag it onto the form using System; using System.Windows.Forms; namespace ComboBoxUpperCase { public partial class UpperComboBox : ComboBox { public UpperComboBox() { InitializeComponent(); } protected override void OnLostFocus( EventArgs e) { DroppedDown = false ; base .OnLostFocus(e); } protected override void OnKeyPress( KeyPressEventArgs e) { e.KeyChar = e.KeyChar.ToString().ToUpper()[0]; DroppedDown = true ; base .OnKeyPress(e); } } }