private void hpGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            //判断要处理的DataGridViewComboBoxColumn名称，若符合条件，编辑控件被强制转换为ComboBox以处理，添加SelectedIndexChanged事件
            if (this.hpGridView1.CurrentCell.OwningColumn.Name == "clmTest")
            {
                ((ComboBox)e.Control).SelectedIndexChanged += new EventHandler(ComboBox_SelectedIndexChanged);
            }

        }