datagridview某列编辑时显示为大写

void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            DataGridView dgv = (DataGridView)sender;
            if (e.Control is DataGridViewTextBoxEditingControl)
            {
                DataGridViewTextBoxEditingControl editControl = (DataGridViewTextBoxEditingControl)e.Control;
                if (dgv.CurrentCell.OwningColumn.Name == "Column1")
                {
                    editControl.CharacterCasing = CharacterCasing.Upper;
                }
                else
                {
                    editControl.CharacterCasing = CharacterCasing.Normal;
                }
            }
        }