How to handle Upper Case in specified column in datagridview

Hi there,

I'm trying to handle Upper Case in one single column in my datagridview, but is not working, all the columns are converted to Upper case

Here is my code:

 private void myDataGrid_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            if (myDataGrid.CurrentCell.OwningColumn.Index == 0)
            {
                ((TextBox)e.Control).KeyPress += new KeyPressEventHandler(toUpperCase);
            }
        }

//And the method toUpperCase
 protected void toUpperCase(object sender, KeyPressEventArgs e)
        {
            e.KeyChar = Char.ToUpper(e.KeyChar);
        }

Any help would be apreciated

Thanks

Bere