Combo box to upper case

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);
}
}
}